HP XP7 Continuous Access Synchronous User Guide Abstract Continuous Access Synchronous helps you create and maintain a synchronous backup of critical data in a remote location. This document describes and provides instructions for planning, configuring, and maintaining a Continuous Access Synchronous system on HP XP7 Storage (XP7) storage systems.
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Contents 1 Continuous Access Synchronous overview......................................................7 How Continuous Access Synchronous works ................................................................................7 Typical components .................................................................................................................8 Storage systems .......................................................................................................................8 Volume pairs .
Host failover software..............................................................................................................32 Data path requirements and configurations................................................................................32 Bandwidth requirements......................................................................................................32 Fibre Channel requirements.................................................................................................
Configuring additional remote paths....................................................................................69 Changing minimum paths, round trip time, other remote connection options..............................69 Deleting remote paths.........................................................................................................70 Deleting Continuous Access Synchronous...................................................................................
Remove Remote Paths wizard.................................................................................................115 Remove Remote Paths window...........................................................................................115 Confirm window..............................................................................................................116 Edit Remote Replica Options wizard........................................................................................
1 Continuous Access Synchronous overview A Continuous Access Synchronous system creates and maintains a mirror image of a production volume at a remote location. Data in a Continuous Access Synchronous backup stays synchronized with the data in the primary XP7 Storage system. This happens when data is written from the host to the primary storage system then to the secondary storage system, via the Fibre Channel data path.
Typical components A typical configuration consists of the following components. Many but not all require user setup. • The primary XP7 storage system is connected to a host. The secondary storage system is connected to the primary system via Fibre Channel data paths. The secondary system may be XP7, other HP model, or a third-party storage system. • A host at the local site, connected to the primary storage system.
Volume pairs As described previously, original data is stored in the P-VOL and the remote copy is stored in the S-VOL. The pair can be split, resynchronized, reverse resynchronized, and returned to unpaired status. • When paired, the volumes are synchronized. • When split, new data is sent to the P-VOL but not the S-VOL. • When resynchronized, data that changed while the pair was split is copied to the S-VOL. • When necessary, data in the S-VOL can be copied to the P-VOL.
Failover software Host failover software is used to transfer information between host servers at the local and remote sites. It is a critical component of any disaster recovery solution. • When Continuous Access Synchronous is used as a disaster recovery tool, host failover is required to ensure effective recovery operations. • When Continuous Access Synchronous is used as a data migration tool, host failover is recommended. Continuous Access Synchronous does not provide host failover functions.
When the host issues an update after the initial copy is complete, the data is written to the P-VOL and copied to the S-VOL. Subsequent updates are held until the current update is completed in both volumes. This keeps the pair synchronized. Pair status The pair status is managed by the primary storage system which manages the P-VOLs. • The primary storage system is able to change the pair status of the P-VOL and the S-VOL.
2 Requirements and specifications This chapter provides basic system requirements. In addition to the information here, “Planning for Continuous Access Synchronous” (page 15) provides many specifications, recommendations, and restrictions for the elements of a Continuous Access Synchronous system that require attention before setting up and using Continuous Access Synchronous. System requirements and specifications The following table describes general system requirements.
Item Requirement of 64 path groups are supported. Multiple path groups can be used in the same combination of primary and secondary storage systems. Path group Groups of remote paths, which allows you to configure or change the configuration of multiple paths at the same time. • A maximum of 64 path groups can be set in a storage system. • The following values can be set as the path group ID: ◦ 0-255 (0 to FF in hexadecimal) when connected to XP7 or P9500.
Item Requirement Host failover software • Required for disaster recovery. • Recommended for data migration. See “Host failover software” (page 32) for more information. Interfaces • Remote Web Console is required. ◦ The following RWC roles are required to operate: - Storage Administrator (Remote Copy) - Storage Administrator (System Resource Management) - Storage Administrator (Provisioning) ◦ The primary system must be LAN-attached to a Remote Web Console computer.
3 Planning for Continuous Access Synchronous This chapter provides information and instructions for planning primary and secondary system, pair volumes, data paths, and other elements. Storage system preparation The following preparations are required for the storage systems in a Continuous Access Synchronous pair relationship. • You can pair the volumes on XP7 Storage with volumes on another XP7, P9500, or XP24000/XP20000 Disk Array.
NOTE: of "3". When using RAID Manager (or Raidcom), the XP7 serial number requires a prefix System options You can tailor XP7 storage systems to enable options not specifically set at the factory. System option modes related to Continuous Access Synchronous are shown in the following table. XP7 option modes are set to their default values at installation, and can be changed only by your HP representative.
Note the following Round Trip Time considerations: • If the difference between Round Trip Time and remote IO response time is significant, the system slows or even interrupts the initial copy operation so that the update copy can continue. Example of significant difference between the two: 1ms RT Time : 500ms remote IO response time. • If the difference between the two is insignificant, initial copying is allowed to run at the specified pace.
The following table shows example settings. Round trip time between MCU RCU [ms] Data path speed Number of data between paths between MCU/RCU MCU/RCU (MB/ms) Initial copy pace Number of maximum initial copy VOLs Round trip time specified [ms] 0 0.1 4 15 64 160 30 0.1 4 15 64 220 100 0.
Planning pairs and pair volumes This section discusses requirements, options, and settings you need for setting up pairs and pair volumes. You begin by: • Identifying data and volumes at the local site that you want to protect with a backup • Setting up volumes at the remote site that will hold copied data. The following helps ensure that the pairs you create fit your requirements.
• Before creating multiple pairs during the Create Pairs operation, make sure to set up S-VOL LDEVs to allow the system to correctly match them to P-VOLs. You must do this because, even though you select multiple volumes as P-VOLs, you specify just one S-VOL. The system automatically assigns subsequent secondary system LDEVs as S-VOLs based on the option you specify for Selection Type.
of the following Fence Level options during the initial copy and resync operations. You can also change the Fence Level option outside these operations. • Data – the P-VOL is fenced if an update copy operation fails. This prevents the host from writing to the P-VOL during a failure. This setting should be considered for the most critical volumes for disaster recovery. This setting reduces the amount of time required to analyze the consistency of S-VOL data with the P-VOL during disaster recovery efforts.
Procedure 1 To calculate the maximum number of pairs 1. Calculate the number of cylinders. 1. Calculate the system's number of logical blocks, which is the volume's capacity measured in blocks. Number of logical blocks = Volume capacity (bytes) / 512 2. Calculate the number of cylinders: For OPEN-3, OPEN-8, OPEN-9, OPEN-E, OPEN-L, OPEN-K: Number of cylinders = ceil ( (ceil (Number of logical blocks / 96) ) / 15) For OPEN-V. Number of cylinders = ceil ( (ceil (Number of logical blocks / 512) ) / 15) 2.
3. Calculate the maximum number of pairs, which is restricted by the following: • The number of bitmap areas required for Continuous Access Synchronous (calculated above). • The total number of bitmap areas in the storage system, which is 65,536. Bitmap areas are also used by Continuous Access Synchronous Z, Continuous Access Journal, and Continuous Access Journal Z.
In this case, because the value of Maximum Initial Copy Activities is 2, initial copy operations for LUN 02 and LUN 00 are started. If either one of the initial copy operations for LUN 02 and LUN 00 is completed, the initial copy for LUN 01 is started. Example 2: initial copy started, new pairs added The following table shows the Priority value when the initial copy is already begun and then two new pairs are added.
Figure notes: • Cnt Ac-S pairs are assigned to a consistency group using RAID Manager. Cnt Ac-S Z pairs are assigned to a consistency group using Business Continuity Manager (BCM). • Open and mainframe volumes (P-VOLs/P-VOLs) receive I/O requests from their applications at the primary (main) site, and data in the volumes is updated. • Cnt Ac-S or Cnt Ac-S Z runs copy operations in the consistency group.
Figure notes: • RAID Manager manages the consistency group on all primary and secondary system. Business Continuity Manager cannot be used with multiple systems. • Open and mainframe primary volumes (P-VOLs/P-VOLs) receive I/O requests from their applications at the primary (main) site, and data in the volumes is updated. • Continuous Access Synchronous or Continuous Access Synchronous Z runs the copy operation in the consistency group.
• The microcode for both primary and secondary systems must support consistency groups between multiple primary and secondary systems; otherwise, pair creation results in failure. • You must install the version of RAID Manager that supports a consistency group consisting of multiple MCUs and RCUs. • Pair operations can be performed from RAID Manager only. Business Continuity Manager and Remote Web Console do not support pair operations for pairs in a CG with multiple XP7s.
5. 6. Create RAID Manager configuration definition file C for the multiple primary and secondary system configuration. Perform the pairresync operation and register them to configuration definition file C. Using an existing CG You can assign new pairs or existing pairs to an existing consistency group. Procedure 4 To assign new pairs to an existing consistency group 1. 2. 3. Add pair information to the existing configuration definition file B, which consists of pairs in multiple XP7s.
• If a split operation is in progress when I/O processing on the pairs begins, the split operation on the pairs is given priority. After the pair is split, then the I/O processing begins. • Data consistency cannot be ensured when all of the following conditions exist: - A port is blocked. - A split command is in progress. - I/O processing begins. In such a case, resynchronize the consistency group and then run the split command again.
Pair status before and after a split operation Pairs in the same consistency group must be in PAIR/Duplex status when you begin the split operation in order to maintain consistency. Otherwise, when the operation completes, pair status will be inconsistent.
CG 127 behavior and restrictions when a pair is suspended Note the following behaviors and restrictions regarding the consistent suspending of all P-VOLs when a pair suspends. • When a failure occurs or if a pair is suspended by RAID Manager, all P-VOLs will be suspended. • When P-VOLs and S-VOLs are registered in CG 127, and both volumes are paired bi-directionally, all of the target pair volumes are registered in CG No.127 when takeover takes place. • The maximum number of pairs in CG 127 is 4,096.
• If all the data paths for Continuous Access Synchronous pairs are disconnected, but the paths used for Cnt Ac-J pairs are connected, failure suspend does not occur and S-VOLs cannot be changed to PSUE status. • If you turn off the power of the primary system when S-VOLs are in PAIR status, all the data paths for the primary system will be disconnected and all the S-VOLs registered in CG 127 will be changed to PSUE status.
Fibre Channel requirements The primary and secondary system must be connected using multimode or single-mode optical fibre cables. • For distances between .5 km to 1.5 km, one switch is required, but you can use a maximum of two switches. • For distances up to 1.5 km (4,920 feet), multimode shortwave Fibre Channel interface cables are used. • For distances from 1.5 km to 10 km, (4,920 feet to 6.2miles) single mode longwave optical fibre cables are required. • For distances from 10 km to 30 km (6.
Set port topology to: Fab off, FC-AL. Switch connection The following figure shows a switch connection, in which up to three optical fibre cables are connected using switches. Two switches can be used. • • Set port topology to the following: ◦ NL port: Fab on, FC-AL ◦ N port: Fab on, Point-to-Point ◦ Some switch vendors require F port (for example, McData ED5000). Host I/O response time can be improved on long distance switch connections by using host mode options 49 and 50, or 51.
Figure 1 Extender Connection • Set port topology to the following: ◦ NL/FL port: Fab on, FC-AL ◦ F port: Fab on, Point-to-Point • Best practice is to create at least two independent data paths (one per cluster) between the primary and secondary system for hardware redundancy for this critical element.
Port attributes Plan and define the following Fibre Channel port attributes for Continuous Access Synchronous: 36 • Initiator ports, which send data. One initiator port can be connected to a maximum of 64 RCU target ports. Configure initiator ports on both primary and secondary system for Continuous Access Synchronous disaster recovery operations. • RCU target ports, which receive data.
4 Sharing Continuous Access Synchronous volumes This chapter helps you plan Continuous Access Synchronous (Cnt Ac-S) pair volumes when they are shared with non-Cnt Ac-S volumes. All the software products that can be used with Cnt Ac-S are discussed here. Volume types that can be shared with Continuous Access Synchronous The following table shows when volumes used by other software can also be used as Cnt Ac-S P-VOLs and S-VOLs.
Volume type Used as Cnt Ac-S P-VOL? Used as Cnt Ac-S S-VOL? P-VOL in PSUS (Delete pair to RCU) status Yes Yes P-VOL in COPY(RS-R)/RCPY status No No BC P-VOL is also used as a Cnt Ac-J P-VOL or S-VOL No No P-VOL (none of the above) Yes Yes S-VOL in PSUS (Delete pair to RCU) status Yes No S-VOL (none of the above) No No Reserved volume No No Business Copy (BC) Continuous Access Journal (Cnt Ac-J) P-VOL in COPY status No No P-VOL in PAIR status 2 Yes No3 P-VOL in PSUS (Delete pa
Cache Residency The volumes which set the Cache Residency can be assigned as the Continuous Access Synchronous pair. You can perform Cache Residency operations on Cnt Ac-S P-VOLs and S-VOLs. For more information, see the HP XP7 Performance for Open and Mainframe Systems User Guide. Data Retention You can create a Cnt Ac-S pair using volumes that have been assigned the access attribute by the Data Retention (DRU). However, you cannot specify a volume with the "S-VOL Disable" attribute as a Cnt Ac-S S-VOL.
The following tables show Cnt Ac-S volumes and status with the Data Retention operations that can be performed using Remote Web Console and RAID Manager.
global virtualization Pairs can be created using volumes in a virtual storage machine. Please note the following: • Though Remote Web Console displays the virtual LDEV ID of a volume belonging to a virtual storage machine, make sure when running pair operations in Remote Web Console that you specify the physical XP7 LDEV ID. • A volume's virtual ID used with Continuous Access Synchronous cannot be deleted. LUN Manager • LUN Manager operations do not affect Cnt Ac-S operations.
Please note the following when sharing Cnt Ac-S volumes with BC volumes. • L1 and L2 BC pairs can be shared with Cnt Ac-S volumes. Both node and leaf S-VOLs are considered secondary volumes by Cnt Ac-S. • BC is recommended for in-system copy operations. However, if BC is not installed, Cnt Ac-S can be used to copy within the same XP7. This configuration requires at least one fibre cable loop. • The BC Quick Restore can be performed when the Cnt Ac-S pair is suspended.
Configurations with Business Copy S-VOLs In the following figure, an BC S-VOL also functions as a Cnt Ac-S P-VOL. This configuration requires that the BC pair is split before the Cnt Ac-S pair is created. Figure 5 Shared BC S-VOL with Cnt Ac-S P-VOL Status reporting and data currency The following table shows the pair status that is reported for different combinations of shared volumes.
Continuous Access Journal Cnt Ac-S and Continuous Access Journal can share the same pair volumes. Using a combined Cnt Ac-S and Continuous Access Journal configuration can extend disaster recovery options to a third data center. Like Cnt Ac-S, a Continuous Access Journal pair maintains a copy of the production volume in a second location.
5 Cnt Ac-S configuration This chapter provides instructions for configuring Continuous Access Synchronous. Configuration workflow You must have Storage Administrator (Remote Copy) role to perform most Continuous Access Synchronous operations using Remote Web Console. Configuration consists of the following operations: • Check prerequisites for each procedure. • See “Planning pairs and pair volumes” (page 19). • On the primary and secondary system, install the data paths.
Procedure 7 To define port attributes 1. 2. 3. 4. In the Storage Systems tree, click Ports/Host Groups. In the Ports/Host Groups window, click the Ports tab and select the port to be changed. From the Actions menu, click Ports/Host Groups > Edit Ports. In the Edit Ports window, select a Port Attribute: Initiator or RCU Target. For all other settings, see the HP XP7 Provisioning for Open Systems User Guide. 5. 6. 7. Click Finish.
• Another field, Minimum Number of Paths, is also covered in more detail in “Determining Minimum Number of Remote Paths” (page 18). • Remote path settings are required in order to perform Cnt Ac-S pair operations and check pair status in Remote Web Console. Make sure to complete the procedure. If you cancel remote path settings, you will be unable to perform operations and check status. Also, operations involving remote paths cannot be performed when changing the microcode.
2. For Minimum Number of Paths, select the minimum number of paths between the secondary and primary system. If the number of paths drops below the minimum, the primary system splits the pair. The maximum is 8; the default is 1. 3. In the path ports boxes, select the ports used by the remote path. You can add more remote paths by clicking the Add Path button. See “Configuring additional remote paths” (page 69) for more information. 8. Click Options to access additional settings, which are optional. 1.
4. Change Storage System Options as needed. Settings apply to the storage system. 1. For Maximum Initial Copy Activities, specify the number of volumes to be copied concurrently per initial copy operation. The range is from 1 to 512 volumes; 64 is the default. Note the following: - This setting may impact performance on the primary system. This depends on the number you specify and the amount of I/O activity.
1. 2. Select the CU with the options to be changed, then click Change CU Options. If you do not want to change CU options, click Finish. In the Change CU Options dialog box, for Maximum Initial Copy Activities, specify the number of volumes to be copied concurrently per initial copy operation for the CU. The range is from 1 to 16 volumes. This option is available only when Maximum Initial Copy Activities is Enabled (step a). 3. 4. 6. 7. 8.
6 Cnt Ac-S pair operations This chapter provides instructions for performing Continuous Access Synchronous pair operations. Pair operations workflow You must have Storage Administrator (Remote Copy) role to perform Continuous Access Synchronous operations. Basic Continuous Access Synchronous operations consist of the following operations. • Check prerequisites for each procedure. • Always check pair status. Each Continuous Access Synchronous operation requires the pair to be in a specific status.
• During this operation, you select P-VOLs and S-VOLs by port, GID, LUN CU, and/or LDEV numbers. • During this operation, you can specify multiple P-VOLs to be paired, but only one S-VOL. In order to plan how the system assigns subsequent S-VOLs, see the bullet, "When creating multiple pairs concurrently...." in “Pair volume requirements and recommendations” (page 19). • During this operation, you can specify whether to fence the P-VOL when an error occurs.
1. For Base Secondary Volume, select the initial S-VOL's Port ID, Host Group ID, and LUN ID. If you are selecting only one P-VOL, this LU is the secondary volume. If you select multiple P-VOLs for pairing, this LUN is the base S-VOL that is assigned to the first P-VOL and from which subsequent S-VOL LUNs are assigned to the list of P-VOLs. CAUTION: In XP24000/XP20000 Disk Array and P9500, LUN IDs display in hexadecimal numbers. In XP7, LUN IDs display in decimal or hexadecimal numbers.
When a pair is split: • I/O writes from the host continue to the P-VOL, but stop to the S-VOL. • Any current update copy operation completes to the S-VOL, ensuring data consistency to the point of the split operation. • Pair status changes to PSUS. • The primary system records the updated tracks to the P-VOL that occur after the split as differential data. This data is copied to the S-VOL when the pair is resynchronized. • You can set an option to block updates to the P-VOL while the pair is split.
Enable is only available when performing the split operation from the pair's primary storage system. • 6. Disable (default), to cause host input to be rejected by the S-VOL while the pair is split. For Primary Volume Write, specify whether writing to the P-VOL is enabled while the pair is split. • Depend on Primary Volume Fence Level: Writing to the P-VOL is based on fence level specified during the Create Pairs operation. This is the default.
5. For Primary Volume Fence Level, specify whether the primary system rejects write operations to the P-VOL when the pair is split due to an error. • - Status: The P-VOL cannot be written to only if the primary system is not able to change S-VOL status to PSUE. • - Never: The P-VOL can always be written to. • - Data: The P-VOL cannot be written to. For more information, see “Allowing I/O to the P-VOL after a split—Fence Level options” (page 20) . 6.
5. 6. 7. 8. For Delete Mode, specify one of the following: • Normal: Deletes the pair only if the primary system can change both P-VOL and S-VOL to unpaired volumes. • Force: Forcibly deletes pairs even when the primary system cannot communicate with the secondary system. Click Finish. In the Confirm window, review the settings and enter a task name in the Task Name box. Click Apply to save your settings to the system.
7 Monitoring and maintaining the Cnt Ac-S system This chapter provides information and instructions for monitoring and maintaining a Continuous Access Synchronous system. Monitoring pair status, license capacity Monitoring the Continuous Access Synchronous system is an ongoing operation that should be performed frequently to keep track of and maintain your pairs. • When you want to perform a pair operation, first check the pair's status. Each operation requires a specific status or set of statuses.
3. From the Actions menu, click Remote Replication > View Pair Properties and review Status. For more information, see “Pair status definitions” (page 60). Procedure 15 To monitor license capacity • See the Summary area in the Replications window. How pair status changes The primary system changes and maintains the status of the P-VOL and is responsible for keeping the P-VOL and its S-VOL synchronized. The secondary system maintains the status of the S-VOL.
◦ When a pair is deleted from the primary system, that system changes the status of the P-VOL and S-VOL to unpaired. ◦ When a pair is deleted from the secondary system, that system changes the S-VOL status to unpaired, and the secondary system detects the pair release and changes the P-VOL status to PSUS. Pair status definitions Both Remote Web Console and RAID Manager pair status names appear in the Status column, except when the names are the same.
RWC status RAID Manager status Description P-VOL access S-VOL access PAIR PAIR • The pair is synchronized Read/Write Read Only Read/Write Read only if S-VOL write option is disabled. • Updates from the host to the P-VOL are duplicated in the S-VOL. PSUS SSUS, PSUS (See also “Split types” (page 62).) • The pair was split by a user or deleted from the secondary system. The pair is not synchronized.
Split types This topic discusses pairs that are split by user operation (PSUS ), and pairs that are suspended by the system because of failure (PSUE). • • You can split a pair when the initial copy operation is complete. ◦ You must split a pair to perform media maintenance on the P-VOL or to access the S-VOL (when S-VOL write is enabled). ◦ When you split a pair, the primary system ensures synchronization by completing any pending update copy operation before changing the status to PSUS.
System behavior Note the following behaviors for split pairs: • The primary system stops performing update operations to the S-VOL. It may or may not continue accepting write I/Os to the P-VOL depending on the P-VOL fence level setting. • If an update fails, the primary system reports a unit check and notifies the host that Write fails. This ensures that both the host system and application program regard the write operation to the P-VOL as failed.
4. The Description column displays operations. They are explained below. Note the following when viewing histories. • Operation rows may not appear in descending, chronological order. • The most recent operations display, up to a maximum of 524,288 operations. Information older than seven days is not shown.
Prerequisite information • Pair status must be COPY or PAIR. • The Edit Pair Options window is used for the following procedure. If you select multiple pairs, the values do not display but are blank. When you change a value, the change applies to all selected pairs Procedure 18 To change the fence level options 1. 2. 3. 4. In the Storage Systems tree, click Replications > Remote Replications. Click the Cnt Ac-S Pairs tab, then select the pair whose options are to be changed.
Prerequisite information • The volume must be unpaired. Procedure 19 To forcibly delete a pair 1. 2. 3. 4. In the Storage Systems tree, click Logical Device. Click the LDEV tab, then select the pair to be forcibly deleted. From the Actions menu, select Remote Replications > Force Delete Pairs (Cnt Ac-S Pairs). In the Force Delete Pairs (Cnt Ac-S Pairs) window, ensure that the volume is in the Selected LDEV table. 5. Click Apply.
Monitoring and maintaining remote connections and paths Procedure 21 To view remote connection status and path information 1. View connection properties and path information by clicking Actions > Remote Connection > View Remote Connection Properties.
2. To check path and port information, from the Storage Systems tree, click Replication > Remote Connections > Connections (To). Check connections under View Port Condition. Check Status and other details in the Connections (To) tab. Remote path status definitions The following table provides remote path status descriptions. Status Definition Normal This path has been successfully established and can be used for Continuous Access Synchronous remote copy activities.
Status Definition Program Error This remote path was blockaded because a program error occurred. In Progress This remote path is in progress of changing the attribute of port. Configuring additional remote paths You can configure additional remote paths as needed. A maximum of eight remote paths are supported. Prerequisite information • Review the path-related prerequisites in “Setting up primary and secondary systems for Cnt Ac-S” (page 46). Procedure 22 To configure additional remote paths 1. 2.
2. 3. 4. 5. 6. 7. 8. 9. Click the Connections (To) tab, then select the remote connection whose options you want to change. From the Actions menu, click Remote Connections > Edit Remote Connection Options. In the Edit Remote Connection Options window, for Minimum Number of Paths, select the minimum number of paths between the remote and primary system. For RIO MIH Time, enter an interval in seconds that, if exceeded, causes the data-transfer operation to be reported as failed by the system.
6. 7. 8. Click Finish. In the Confirm window, review the settings and enter a task name in the Task Name box. Click Apply to save your settings in the system. Deleting Continuous Access Synchronous You can delete the Continuous Access Synchronous relationship between the primary and secondary systems. This is done by deleting remote connections. Prerequisite information • All Cnt Ac-S pairs must be deleted before removing the connection.
(You can review information about the connection by clicking Detail.) 6. Click Apply. Managing power-off for systems and network devices Though you are responsible for controlling power-off activities, it is advisable to check with your HP representative for assistance. The following topics provide information for planned outages when Continuous Access Synchronous is present.
Procedure 26 To perform a planned outage of a secondary system or data path component 1. Identify the P-VOLs that are paired with S-VOL in the secondary system that is to be powered off. For data path outage, identify all P-VOLs in the primary system that use the path or component to be powered off. You need to know the MCU, CU, and LDEV ID (port, GID, LUN) for each of the P-VOLs. 2. 3. 4. Connect to each primary system that contains affected P-VOLs, and split all affected pairs.
8 Data migration This chapter discusses using Continuous Access Synchronous to migrate data from one storage system to another. Migration overview Continuous Access Synchronous can be used to move data from one system to another.
9 Disaster recovery This chapter discusses disaster recovery. Disaster recovery overview Preparing for disaster recovery involves the following major steps: 1. Identify the volumes and groups that contain important files and data for disaster recovery. 2.
You can switch operations to the remote site either by deleting pairs, then reestablishing them when recovery is completed; or by not deleting pairs. Both methods are presented below. Procedure 28 To switch operations to the remote site by deleting pairs 1. 2. 3. 4. 5. Record the pair status and fence level of each S-VOL. Analyze the consistency of the S-VOLs, based on pair status and P-VOL fence level setting. See “Checking S-VOL consistency with the P-VOL” (page 76). Perform file recovery as needed.
The following table shows S-VOL consistency information, based on Remote Web Console pair status and the P-VOL fence level setting. S-VOL status Type Fence level Consistency of S-VOL Unpaired -- Data Status Never Not consistent. The S-VOL does not belong to a pair. Even if you have created a pair using this volume, if the pair status is still unpaired, you must regard its data as not consistent with the P-VOL. COPY -- Data Status Never Not consistent.
3. 4. At the local site, delete the Cnt Ac-S association with the secondary systems (Remove Remote Connection). In Remote Web Console, connect to each primary system to make sure that all RCUs are deleted. At the local and remote sites, change path and port settings. - If you plan to use the same remote paths: • At the local site, change the existing initiator ports to RCU target ports. • At the remote site, change the existing RCU target ports to initiator ports.
10 Troubleshooting This chapter provides Continuous Access Synchronous troubleshooting information. Error codes and messages Remote Web Console displays messages when error conditions occur during Continuous Access Synchronous operations. The message describes the error and provides a part code and error code. The error message may also include a XP7 error code. You may need to contact HP for assistance. See HP XP7 Remote Web Console User Guide for a list of the error codes.
Error Corrective action The paircreate or pairresync operation resulted in a timeout error. • Hardware failure: If the timeout error was caused by a hardware failure, a SIM is generated. If this occurs, call service personnel, then retry Continuous Access Synchronous operations after the problem is fixed. • Heavy workload: If no SIM was generated, wait 5 or 6 minutes then check the pair's status. - If status changed correctly, the failed operation completed after the timeout message was issued.
Path status Description system are being used for other connections. Corrective action secondary systems, initiator ports for primary systems. If necessary, connect to the secondary system to delete paths. • Reconfigure the ports, then add the paths and RCUs to the MCU again. Serial Number Mismatch The secondary system's S/N does not match the specified S/N. • Make sure that you entered the correct secondary system S/N and Controller ID, and primary and secondary system port numbers.
Path status Program Error Description Corrective action The path relay equipment does not work. Repair the path relay equipment, then restore the path*. The connection cable is physically broken. Replace the broken cable, then restore the path*. A program error is detected. Restore the path*. * To restore a path, delete and then add the path again. It may be necessary to delete and then add the RCU again.
Where: • * is the instance number. • HOST is the host name. Example: Error codes appear on the right of the equal symbol (=). Review RAID Manager error codes in the following topics.
Error code Description (SSB2) B990 The pair cannot be created because the consistency group number is greater than is allowed. If this error occurred when you did not specify the consistency group number, Contact HP for assistance. B994 The Swap Resync operation cannot be performed because the S-VOL is not in PSUS or SSWS status. (Swap Resync resynchronizes differential data when the S-VOL is swapped for the P-VOL.) B998 The pair cannot be created because the secondary system path setting is invalid.
Error code Description (SSB2) C233 The command was rejected because the S-VOL status is unpaired. C234/C235/C236/C237 The command was rejected because an internal logical error has occurred. C238 The command was rejected because the specified volume is the volume other than the P-VOL. C239 The command was rejected because the pair resync was operated on a volume whose status is other than PSUS (by user) PSUS (because of failure).
Error code Description (SSB2) C316 The P-VOL is in the process of drive copy for failure assistance. C317 The P-VOL is in the process of drive copy for an SVP request. C318 The P-VOL is terminating the copy task. C319 The P-VOL is in the process of collection copy. C31A The P-VOL is in the process of collection access. C31B The P-VOL is blocked. C31C The P-VOL is blocked and impossible to access. C31D The P-VOL is being formatted. C31E The P-VOL is read only.
Error code Description (SSB2) C33C A request for a Paircreate operation was rejected because the specified S-VOL was not mounted. C33E The pair cannot be created because the S-VOL is not implemented or is blocked (DEV NOT READY status). C33F The corresponding volume cannot be specified as an S-VOL because the volume is already specified as a Cnt Ac-S pair volume. C35C The P-VOL is not accessible.
Error code Description (SSB2) C3A0 The P-VOL is a device not supported by Cnt Ac-S. C3A6 The SSID or CU number of the secondary system is invalid. C3A8 The device type combination between the P-VOL and S-VOL is invalid. C3AA The secondary system's cache is blocked on one side. C3AB The secondary system's cache is blocked on one side. C3AC Cnt Ac-S is not supported for this controller emulation type of the secondary system. C3AD The secondary system capacity exceeds the license capacity.
Error code Description (SSB2) The volume is a THP V-VOL; the pair using the volume is a BC, Fast Snap, or Snapshot pair, or a Auto LUN reserve volume. The volume is a THP V-VOL and an addition to volume capacity is in progress, or pages are being released. The capacity of the volume is different from the capacity of the P-VOL The volume is initialized by BC C3DA The pair cannot be created because the volume specified for the P-VOL is a system volume. C3DB S-VOL pair status is not PSUS or PSUE.
Error code Description (SSB2) CBD8 A pair cannot be created because the specified primary system is one of the following: • A journal volume used for Cnt Ac-J. • A Cnt Ac-J secondary volume that is in a status other than Suspend. CBDA The Paircreate operation cannot run because the used capacity of the Data Retention on the secondary system exceeds the license capacity. CBDC A request for a Paircreate operation was received in the Cnt Ac-S-Cnt Ac-J combination status.
Error code Description (SSB2) FD05 The specified local storage system does not support global virtualization. FD06 The pair cannot be created because the volume specified as the P-VOL is used as an external volume for nondisruptive migration and also used as a volume for a Volume Migration pair. SSB2=B992 error codes when SSB1 = B901 or B90A Error Code Error Code Description (SSB1) (SSB2) B901 B992 Pair cannot be created because DKC type dose not support Cnt Ac-S Asynchronous.
11 Support and other resources Contacting HP For worldwide technical support information, see the HP support website: http://www.hp.
HP websites For additional information, see the following HP websites: • http://www.hp.com • http://www.hp.com/go/storage • http://www.hp.com/service_locator • http://www.hp.com/support/manuals • http://www.hp.com/support/downloads • http://www.hp.
Table 1 Document conventions (continued) Convention Element Monospace text • File and directory names • System output • Code • Commands, their arguments, and argument values Monospace, italic text • Code variables • Command variables Monospace, bold text WARNING! CAUTION: IMPORTANT: NOTE: TIP: 94 Emphasized monospace text Indicates that failure to follow directions could result in bodily harm or death. Indicates that failure to follow directions could result in damage to equipment or data.
A Cnt Ac-S GUI reference This appendix describes Remote Web Console windows and fields used for Continuous Access Synchronous. The following key topics are covered: Important: Procedures in this manual are tailored to the Remote Web Console (RWC) GUI. When using this GUI, "Local Storage System" displays for the system you have accessed on the RWC server.
Summary section Item Description Licensed Capacity (Used/Licensed) Used capacity and licensed capacity for each local and remote replication program product. Number of Replica LDEVs Number of LDEVs used in replication. Number of FC Z/FCSE relationships Number of Compatible FlashCopy and Compatible FlashCopy SE relationships. Number of differential tables Number of differential tables in use. View Histories - Local Replication Clicking opens the Histories window for local replication.
Item Description Export Clicking opens the window for exporting the table information. * This item does not display unless you add it in the Remote Web Console Column Settings window. To open the window, in the Remote Replication window, Cnt Ac-J tab, click Options > Column Settings Remote Replication window Use this window to view information about remote replication pairs and mirrors (Cnt Ac-J/Cnt Ac-J Z only). In this topic, you can view the following tables.
Item Description • Pair Position: Whether the volume is a primary or secondary volume. • Provisioning Type1: Volume's provisioning type. • Emulation Type1: Volume's emulation type. • Capacity1: Volume's capacity. • CLPR1: Volume's CLPR. • Virtual storage machine1: Virtual storage machine's model type and serial number. • Virtual LDEV ID1: Volume's virtual LDEV identifier.
Item Description Create Pairs Clicking opens the Create Pairs window. Split Pairs Clicking opens the Split Pairs window. Resync Pairs Clicking opens the Resync Pairs window. View Pair Synchronous Rate2 Clicking opens the View Pair Synchronous Rate window when the pair's primary system is accessed. View Pair Properties2 Clicking opens the View Pair Properties window. View Remote Connection Properties2 Clicking opens the View Remote Connection Properties window.
Item Description • Virtual Device Name1: Volume's vrtual device name, in the format: virtual emulation type/number of virtual LUSE volumes/virtual CVS attribute - Only attributes that are specified display. - "CVS" displays at the end of the device name, if the virtual CVS attribute is specified. - A blank indicates that no values are specified. • Virtual SSID1: Volume's virtual SSID. A blank indicates that no virtual SSID is specified.
Mirrors tab Cnt Ac-J/Cnt Ac-J Z only. Item Description Journal ID Journal identifier. Clicking opens the Journal Volumes window. Mirror ID Mirror identifier. Journal Type Journal's copy type, Cnt Ac-J or Cnt Ac-J Z, plus one of the following configurations: • Standard, a normal pair • 2DC cascade Attribute Whether the journal is Master, Restore, or Initial-registered but with no pair volumes assigned to it. Status Mirror status.
Item Description master journal to the secondary mirror, both the primary and secondary mirrors will have the same Path Watch Time value. • Yes: The Path Watch Time value will be forwarded to the secondary mirror. • No: The Path Watch Time value will not be forwarded to the secondary mirror. Copy Pace1 Indicates the speed of initial copy of a volume. Slower, Medium, or Faster is displayed. A hyphen is displayed if the journal is a restore journal.
View Port Condition Item Description Connections (To) • System: Number of system-to-system connections from local to remote system. • CU: Number of CU-to-CU connections from local to remote system. Remote Storage System Number of remote systems connected to the local system. Connections (From) • System: Number of system-to-system connections from remote to local system. • CU: Number of CU-to-CU connections from remote to local system.
Item Description Status Remote connection status. • Normal: All remote paths are normal. • Failed: All remote paths are abnormal. • Warning: Some remote paths are abnormal. Number of Remote Paths Number of remote paths. The following four columns do not display unless you add them in the Remote Web Console Column Settings window. To open the window, in the Remote Replication window, Cnt Ac-J tab, click Options > Column Settings. Minimum Number of Paths The specified minimum number of paths.
Item Description Path Group ID Path group identifier. Export Clicking opens the window for exporting the table information. Add Remote Connection wizard Use this wizard to set up storage systems for replication. Add Remote Connection window Use this window to connect storage systems for remote replication. For complete information and instructions, see “Setting up primary and secondary systems for Cnt Ac-S” (page 46). In this topic, you can view the following tables.
Local Storage System Item Description Model Local model. Serial Number Local serial number. Local CU Cnt Ac-S Z only. Local system CU number. Displays when Connection Type is CU. Remote Storage System Item Description Model Remote system's model.
Item Description Time limit between 1 and 500 milliseconds for data copy from P-VOL to S-VOL (1 is the default). FREEZE Option Cnt Ac-S Z only. Enables or disables support for the CGROUP (FREEZE/RUN) PPRC TSO command. Confirm window In this topic, you can view the following tables. • “Selected Remote Connection table” • “Selected Remote Paths table” Selected Remote Connection table Item Description Connection Type System or CU. Local CU Cnt Ac-S Z only. Specified local system CU number.
Item Description Roundtrip Time (msec.) Specified roundtrip time. FREEZE Option Specified FREEZE option. Selected Remote Paths table Item Description Local Port ID Local system port identifier. Remote Port ID Remote system port identifier. View Remote Connection Properties window Use this window to view information about remote connections and paths. In this topic, you can view the following tables.
Remote Connection Properties table Item Description Connection Type • System: system-to-system connection. • CU: CU-to-CU connections. Local CU Local system CU number. Remote Storage System • Model / Serial Number: Model and serial number. • CU: CU number. • SSID: SSID. Path Group ID Path group identifier. Channel Type Type of data path, which is fibre. Status Remote connection status. Minimum Number of Paths The specified minimum number of remote paths.
Selected Remote Connection table Item Description Connection Type • System: system-to-system connection. • CU: CU-to-CU connections. Local CU Local system CU number. Remote Storage System Information about the remote system. • Model / Serial Number: Model and serial number. • CU: CU number. • SSID: SSID number. Cnt Ac-S Z only. Path Group ID Cnt Ac-S only. Path group identifier. Status Path status. Number of Remote Paths Number of remote paths including those being added.
Selected Remote Connection table Item Description Minimum Number of Paths Minimum number of remote paths. • Cnt Ac-S and Cnt Ac-S Z: Range is from 1 to 8. • Cnt Ac-J and Cnt Ac-J Z: The minimum number is 1, regardless of the number entered. RIO MIH Time Time limit between 10 and 100 seconds for the data-transfer operation to complete (15 is the default). Roundtrip Time Cnt Ac-S/Cnt Ac-S Z only. Time limit between 1 and 500 milliseconds for data copy from P-VOL to S-VOL (1 is the default).
Confirm window Selected Remote Connection table Item Description Connection Type • System: system-to-system connection. • CU: CU-to-CU connections. Local CU Local system CU number. Remote Storage System Information about the remote system. • Model / Serial Number: Model and serial number. • CU: CU number. • SSID: SSID number. Cnt Ac-S Z only. Path Group ID Cnt Ac-S only. Path group identifier. Number of Remote Paths Number of remote paths including those being added.
Add Remote Paths window Use this window to add remote paths to a remote connection. For complete information and instructions, see “Configuring additional remote paths” (page 69). In this topic, you can view the following tables. • “Local Storage System” • “Remote Storage System” • “Remote Paths” Local Storage System Item Description Model Local system model. Serial Number Local system serial number. Local CU Local system CU number.
Item Description Port lists • Left side list: local system port identifier. • Right side list: remote system port identifier Add Paths Clicking adds more paths, up to eight. Confirm window In this topic, you can view the following tables. • “Selected Remote Connection table” • “Selected Remote Paths table” Selected Remote Connection table Item Description Connection Type • System: system-to-system connection. • CU: CU-to-CU connections. Local CU Local system CU number.
Item Description Number of Remote Paths Number of remote paths including those being added. Minimum Number of Paths Specified minimum number of remote paths. Selected Remote Paths table Item Description Local Port ID Local system port identifier. Remote Port ID Remote system port identifier. Remove Remote Paths wizard Use this wizard to remove paths from a remote connection. Remove Remote Paths window Use this window to remove paths from a remote connection.
Remote Storage System Item Description Model Remote system model. Serial Number Remote system serial number. Remote CU Remote system CU number. SSID Remote system SSID. Remote Paths Item Description Path Group ID Path group identifier. A hyphen displays for CU connection. Minimum Number of Paths Specified minimum number of remote paths. Port lists • Left side list: local system port identifier.
Item Description Remote Storage System Information about the remote system. • Model / Serial Number: Model and serial number. • CU: CU number. • SSID: SSID number. Cnt Ac-S Z only. Path Group ID Cnt Ac-S/Cnt Ac-J/Cnt Ac-J Z only. Path group identifier. Number of Remote Paths Number of remote paths including those being added. Minimum Number of Paths Specified minimum number of remote paths. Selected Remote Paths table Item Description Local Port ID Local system port identifier.
In this topic, you can view the following tables.
Item Description • Cnt Ac-S Z: Continuous Access Synchronous Z • Cnt Ac-J Z: Continuous Access Journal Z Storage System Options Item Description Maximum Initial Copy Activities Number of volumes that can be copied per initial copy operation. Cnt Ac-S/Cnt Ac-S Z pair: 1 - 512. Cnt Ac-J/Cnt Ac-J Z pair: 1 - 128 Path Blockade Watch Cnt Ac-S/Cnt Ac-S only. Number of seconds for the system to monitor blocked paths Path Blockade SIM Watch Cnt Ac-S/Cnt Ac-S Z only.
Change CU Options window Item Description Maximum Initial Copy Activities Number of volumes that can be copied per initial copy operation. PPRC support by host Cnt Ac-S Z only. Whether PPRC is supported by the host. Services SIM of Remote Copy 120 Cnt Ac-S GUI reference Whether services SIMs in the remote CU are reported to the host.
Confirm window In this topic, you can view the following tables. • “Storage System Options” • “CU Options ” Storage System Options Item Description Maximum Initial Copy Activities Number of volumes that can be copied per initial copy operation. Path Blockade Watch (sec.) Cnt Ac-S/Cnt Ac-S Z only.
Item Description Path Blockade SIM Watch (sec.) Cnt Ac-S/Cnt Ac-S Z only. Number of seconds for the system to monitor SIMs reported for blocked paths Services SIM Cnt Ac-S/Cnt Ac-S Z only. Whether services SIMs are reported to the host. CU Options Item Description CU CU number. Maximum Initial Copy Activities Number of volumes that can be copied per initial copy operation. PPRC support by host Cnt Ac-S Z only. Whether PPRC is supported by the host. Services SIM Cnt Ac-S Z only.
In this topic, you can view the following tables. • “Settings” • “Primary Volume Selection” • “Secondary Volume Selection” • “Mirror Selection” • “Options” • “Selected Pairs table” Settings Item Description Copy Type Type of pair: • Cnt Ac-S: Continuous Access Synchronous • Cnt Ac-J: Continuous Access Journal • Cnt Ac-S Z: Continuous Access Synchronous Z • Cnt Ac-J Z: Continuous Access Journal Z Local CU Cnt Ac-S Z only.
Item Description Local system's CU number. You can select the CU number of the local storage system between [00] and [FE]. Remote Storage System Selections in the remote system. • Model / Serial Number: Model and serial number. • Path Group ID: Select the ID of the path group. Does not display for Cnt Ac-S Z. • CU/SSID: CU number and SSID. Cnt Ac-S Z only. Specify this when you select a provisional CU number in Local CU.
Mirror Selection Cnt Ac-J and Cnt Ac-J Z only. Item Description Master Journal Master journal number and type. Mirror ID Mirror's identifier. Restore Journal Restore journal number. Current Number of Master Journal Mirrors Number of mirrors in the master journal. Total Number of Master Journal Mirrors Displays the following: • Number of mirrors in the master journal. • Number of mirrors added during the Create Pairs operation. • Number of mirrors for the selected volume in Selected Pairs table.
Item Description Host I/O Time Stamp Transfer Cnt Ac-S Z only. Whether the host I/O time stamp is transferred from P-VOL to S-VOL. Error Level Cnt Ac-J and Cnt Ac-J Z only. Whether to split all pairs in the mirror if a failure occurs during this operation: • Mirror: Pairs in the mirror are split. • LU (Cnt Ac-J) or Volume (Cnt Ac-J Z): Only the failed pair is split. CFW Cnt Ac-J Z only. Whether to copy cache fast write (CFW) data to the S-VOL. • Primary Volume Only: Does not copy. Default.
Item Description Initial Copy Priority Scheduling order for pair create operation. CFW Data Cnt Ac-S Z only. Whether CFW data is copied to the S-VOL. DFW to Secondary Volume Cnt Ac-S Z only. Whether the primary system splits pairs when the secondary system cannot copy DFW data to the S-VOL. Host I/O Time Stamp Transfer Cnt Ac-S Z only. Whether the host's time stamp is transferred to the S-VOL. Error Level Cnt Ac-J and Cnt Ac-J Z only.
Item Description Base Secondary Volume Selections for the initial S-VOL. Cnt Ac-S and Cnt Ac-J only. • Port ID: Port identifier. • Host Group ID: Host group identifier. • LUN ID: LUN identifier. Cnt Ac-S Z and Cnt Ac-J Z only. • LDKC: "00" displays, cannot be changed. • CU: For Cnt Ac-S Z: the volume's CU number. For Cnt Ac-J Z: the remote system's CU number, ranging from 00 to FF. • LDEV: LDEV number, ranging from 00 to FF. • Interval: The interval for allocating S-VOLs to P-VOLs.
Item Description Initial Copy Type Whether data is copied to the S-VOL when the pair is created. • Entire Volume: Data is copied. The default. • None: Data is not copied. If you choose this option, you should confirm the data be equal between the P-VOL and S-VOL. • Delta: Data is not copied. Cnt Ac-J and Cnt Ac-J Z only. If the pair is Continuous Access Journal pair, the status will be changed to HOLD or LOLDING as a pair for delta resync.
Confirm window Selected Pairs table Item Description Local Storage System Information about volumes in the accessed system. • LDEV ID: LDEV identifier. • LDEV Name: LDEV name. • Port ID: Port identifier. Cnt Ac-S/Cnt Ac-J only. • Host Group Name: Host group name. Cnt Ac-S/Cnt Ac-J only. • LUN ID: LUN identifier. Cnt Ac-S/Cnt Ac-J only. • Emulation Type: Volume's emulation type. Cnt Ac-S Z/Cnt Ac-S/Cnt Ac-J Z only. • Journal ID: Journal's identifier. Cnt Ac-J/Cnt Ac-J Z only.
Item Description Remote Storage System Information about volumes in the system connected to the system you accessed. • Model / Serial Number: Model and serial number. • SSID: SSID number. Cnt Ac-S Z only. • LDEV ID: LDEV identifier. Cnt Ac-S Z/Cnt Ac-J Z only. • Port ID: Port identifier. Cnt Ac-S/Cnt Ac-J only. • Host Group Name: Host group name. Cnt Ac-S/Cnt Ac-J only. • LUN ID: LUN identifier. Cnt Ac-S/Cnt Ac-J only. • Journal ID: Journal's identifier. Cnt Ac-J/Cnt Ac-J Z only.
Item Description Whether to split all pairs in the mirror if a failure occurs during this operation: • Mirror: Pairs in the mirror are split. • Volume: Only the failed pair is split. CFW Cnt Ac-J Z only. Whether to copy cache fast write (CFW) data to the S-VOL. • Primary Volume Only: Does not copy. Default. • Secondary Volume Copy: Copies. Split Pairs wizard Use this wizard to split pairs. Split Pairs window Use this window to split pairs.
Item Description • Pair Position: Whether volume is a P-VOL or S-VOL. • Emulation Type: Volume's emulation type. • Capacity: Volume's capacity. • CLPR: Volume's CLPR. Copy Type Type of pair: • Cnt Ac-S: Continuous Access Synchronous • Cnt Ac-S Z: Continuous Access Synchronous Z Status Pair status. Remote Storage System Information about the remote system. • Model / Serial Number: Model and serial number. • SSID: SSID number. Cnt Ac-S Z only. • LDEV ID: LDEV identifier. Path Group ID Cnt Ac-S only.
Confirm window Selected Pairs table Item Description Local Storage System Information about volumes in the accessed system. • LDEV ID: LDEV identifier. • LDEV Name: LDEV name. • Pair Position: Whether volume is a P-VOL or S-VOL. • Emulation Type: Volume's emulation type. • Capacity: Volume's capacity. • CLPR: Volume's CLPR. Copy Type Type of pair: • Cnt Ac-S: Continuous Access Synchronous • Cnt Ac-S Z: Continuous Access Synchronous Z Status Pair status. Secondary Volume Write Cnt Ac-S only.
Item Description A hyphen displays if performing the split operation from the pair's secondary storage system, regardless of the selected option. Fence Level P-VOL's fence level setting. SSB Transfer (F/M=FB) Cnt Ac-S Z only. Whether to report SSB (sense byte) to the host. Enable/Disable. A hyphen displays if performing the split operation from the pair's secondary storage system, regardless of the selected option. Remote Storage System Information about the remote system.
In this topic, you can view the following tables. • “Selected Pairs table” • “Setting Fields” Selected Pairs table Item Description Local Storage System Information about volumes in the accessed system. • LDEV ID: LDEV identifier. • LDEV Name: LDEV name. • Emulation Type: Volume's emulation type. • Capacity: Volume's capacity. • CLPR: Volume's CLPR. Copy Type Type of pair: • Cnt Ac-S: Continuous Access Synchronous • Cnt Ac-S Z: Continuous Access Synchronous Z Status Pair status.
Item Description CTG Utilization Whether the consistency group is shared by multiple storage systems. • Single: The consistency group consists of a single pair of primary and secondary storage systems. • Multi: The consistency group consists of multiple storage systems. Preserve Mirror Status Cnt Ac-S Z only. Preserve mirror status. Copy Priority Order that pairs are resynchronized.
Selected Pairs table Item Description Local Storage System Information about volumes in the accessed system. • LDEV ID: LDEV identifier. • LDEV Name: LDEV name. • Pair Position: Whether volume is a P-VOL or S-VOL. • Emulation Type: Volume's emulation type. • Capacity: Volume's capacity. • CLPR: Volume's CLPR. Copy Type Type of pair: • Cnt Ac-S: Continuous Access Synchronous • Cnt Ac-S Z: Continuous Access Synchronous Z Status Pair status.
For complete information and instructions, see “Deleting pairs” (page 56). In this topic, you can view the following tables. • “Selected Pairs table” • “Settings” Selected Pairs table Item Description Local Storage System Information about volumes in the accessed system. • LDEV ID: LDEV identifier. • LDEV Name: LDEV name. • Pair Position: Whether volume is a P-VOL or S-VOL. • Emulation Type: Volume's emulation type. • Capacity: Volume's capacity. • CLPR: Volume's CLPR.
Item Description CTG ID Pair's consistency group identifier. CTG Utilization Whether the consistency group is shared by multiple storage systems. • Single: The consistency group consists of a single pair of primary and secondary storage systems. • Multi: The consistency group consists of multiple storage systems. Preserve Mirror Status Cnt Ac-S Z only. Preserve mirror status. Fence Level Whether the P-VOL can be written to when the pair is split due to error. • Data: The P-VOL cannot be written to.
Selected Pairs table Item Description Local Storage System Information about volumes in the accessed system. • LDEV ID: LDEV identifier. • LDEV Name: LDEV name. • Pair Position: Whether volume is a P-VOL or S-VOL. • Emulation Type: Volume's emulation type. • Capacity: Volume's capacity. • CLPR: Volume's CLPR. Copy Type Type of pair: • Cnt Ac-S: Continuous Access Synchronous • Cnt Ac-S Z: Continuous Access Synchronous Z Status Pair status. Delete Mode How the pair is deleted.
Selected LDEVs table Item Description LDEV ID LDEV identifier. LDEV Name LDEV name. Emulation Type Emulation type. Capacity Capacity. CLPR CLPR number. Edit Pair Options wizard Use this wizard to change pair options. Edit Pair Options window Use this window to change pair options. For complete information and instructions, see “Changing P-VOL Fence Level” (page 64).
Item Description Primary Volume Fence Level Whether the P-VOL can be written to when the pair is split due to error. • Data: The P-VOL cannot be written to. • Status: The P-VOL can be written to only if the primary storage system can change S-VOL status to PSUE (Continuous Access Synchronous) or Suspend (Continuous Access Synchronous Z); otherwise no. • Never: The P-VOL can be written to. The value set for the selected pair is the default. CFW Data Cnt Ac-S Z only.
Confirm window Selected Pairs table Item Description Local Storage System Information about volumes in the accessed system. • LDEV ID: LDEV identifier. • LDEV Name: LDEV name. • Pair Position: Whether volume is a P-VOL or S-VOL. • Emulation Type: Volume's emulation type. • Capacity: Volume's capacity. • CLPR: Volume's CLPR. Copy Type Type of pair: • Cnt Ac-S: Continuous Access Synchronous • Cnt Ac-S Z: Continuous Access Synchronous Z Fence Level P-VOL fence level. CFW Data Cnt Ac-S Z only.
Item Description Path group identifier. Preserve Mirror Status Cnt Ac-S Z only. Preserve mirror status. View Pair Properties (Remote) window Use this window to view the data related to pairs and their volumes. For complete information and instructions, see “Monitoring pair status, license capacity” (page 58). In this topic, you can view the following tables.
Item Description • Provisioning Type: Volume's provisioning type. • Emulation Type, Capacity: Local system's emulation type and capacity. • Model/Serial number, CLPR: Local system's model, serial number, and CLPR. Copy Type, Status Pair's copy type and pair status. Path Group Pair's path group. If the P-VOL is in the primary storage system, clicking the path group ID (Cnt Ac-S) or Remote Paths (Cnt Ac-S Z) displays the remote path list.
Item Description Initial Copy Priority Scheduling order for the initial copy operation. Range is 1 to 256 for Cnt Ac-S; 0 to 256 for Cnt Ac-S Z; default is 32. Paired Time Date and time pair-creation was completed. Last Update Time Date and time that the last update was run. Pair Copy Time Elapsed time for paircreate or pairresyc operation. CFW Data Cnt Ac-S Z only. Whether CFW data is copied to the S-VOL as specified during pair creation. DFW to Secondary Volume Cnt Ac-S Z only.
Item Description • Pair Position: Whether the volume is a primary or secondary volume. • CLPR: Volume's CLPR. • Virtual storage machine: Virtual storage machine's model type and serial number. • Virtual LDEV ID: Volume's virtual LDEV identifier. • Virtual Device Name: Volume's vrtual device name, in the format: virtual emulation type/number of virtual LUSE volumes/virtual CVS attribute - Only attributes that are specified display.
In this topic, you can view the following tables. • “Settings” • “Histories table” Settings Item Description Copy Type Type of pair: • Cnt Ac-S: Continuous Access Synchronous • Cnt Ac-J: Continuous Access Journal • Cnt Ac-S Z: Continuous Access Synchronous Z • Cnt Ac-J Z: Continuous Access Journal Z Last Updated Date and time of the last update. Displays after Copy Type is specified. Page Number Page number. Click the button, turn over the page. Displays after Copy Type is specified.
Item Description Remote Storage System Information about volumes in the system connected to the system you accessed. • LDEV ID: LDEV identifier. • Provisioning Type: Whether the volume is Basic (internal) or External. EXCTG ID EXCTG identifier. Cnt Ac-J Z only. 150 Description Describes the operation. Copy Time Elapsed time for create or resync pairs operation. When the Description is other than Pair Add Complete or Pair Resync. Complete, a hyphen displays.
Glossary allocation The ratio of allocated storage capacity versus total capacity as a percentage. Allocated storage refers to those logical devices (LDEVs) that have paths assigned to them. Allocated storage capacity is the sum of the storage of these LDEVs. Total capacity is the sum of the capacity of all LDEVs on the disk array. BC P9000 or XP Business Copy. An HP application that provides volume-level, point-in-time copies in the disk array.
to be associated with 1 to 36 LDEVs. Essentially, LUSE makes it possible for applications to access a single large pool of storage. M-VOL Main volume. MCU Main control unit. OPEN-x A general term describing any of the supported OPEN emulation modes (for example, OPEN-E). There are two types of OPEN-x devices: legacy OPEN-x devices with a fixed size (such as OPEN-3, OPEN-8, OPEN-9, and OPEN-E), and OPEN-V, which has a variable size and is a CVS-based volume.
Index A additional shared memory, 15 Auto LUN, 44 B bandwidth, 32 bitmap areas, 22 Business Copy, sharing volumes, 41 C cache memory changes, and pair status, 15, 61 cache planning considerations, 15 cache requirement, 15 consistency groups description, 9 keeping status consistent, 30 planning, 24 requirements, 26 contacting HP, 92 Continuous Access Journal, sharing volumes with, 44 Continuous Access Synchronous components, 8 consistency groups, 24 copy operations described, 10 data path planning, 32 disa
O operations history, monitoring, 63 overview, 7 P pair status changing cache or shared memory, 15, 61 definitions, 60 monitoring, 58 pairs calculating maximum supported, 21 creating, 51 deleting, 56 duplicate volumes and hosts, 20 forcibly deleting, 65 general information, 9 planning, 19 requirements, recommendations, 19 resynchronizing, 55 splitting, 53 synchronization rate, 63 Performance Monitor, sharing volumes with, 41 performance, planning for, 16 port attributes, 36 port requirements, 35 ports defi
