HP StorageWorks Snapshot XP user guide Part number: T1713-96021 Fourth edition: June 2006
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Contents About this guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Supported storage platforms and firmware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Prerequisites. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Snapshot XP operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Displaying the Business Copy XP main pane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Volume list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Preset List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
18 19 20 21 Tables 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 Snapshot XP pane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Detail pane for Snapshot XP pair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-Vol Path pane . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . History pane . . . . . . . . . . . . .
About this guide This guide provides information about: • Understanding Snapshot XP and Business Copy XP • Understanding Snapshot XP functions • Preparing to use Snapshot XP • Using Snapshot XP • Troubleshooting Snapshot XP Supported storage platforms and firmware In this guide, the term array refers to the following storage platforms: • HP StorageWorks XP12000 Disk Array • HP StorageWorks XP10000 Disk Array • HP StorageWorks 200 Storage Virtualization System For information about required firmware version
Document conventions and symbols Document conventions Table 1 Convention Element Blue text: Table 1 Cross-reference links and e-mail addresses Blue, underlined text: (http://www.hp.
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1 Overview of copy solutions HP StorageWorks XP12000/XP10000/SVS200 arrays provide an extensive suite of data replication software. This chapter describes HP StorageWorks Snapshot XP. This chapter also covers portions of HP StorageWorks Business Copy XP because Snapshot XP is an integrated feature of Business Copy XP. NOTE: The use of Snapshot XP, Business Copy XP, and all other software products is governed by the terms of your license agreements with Hewlett-Packard.
Figure 1 illustrates the mechanism Snapshot XP uses to copy data in the array. Figure 1 Snapshot XP mechanism In Figure 1, Data A is stored in the Snapshot XP pair’s P-VOL. When the host requests to update Data A to Data B, Snapshot XP copies Data A to the pool volume (pool-VOL) in the pool before updating the P-VOL. After the copy operation for Data A is complete, Snapshot XP writes Data B to the area where Data A was stored in the P-VOL, and the P-VOL is updated.
Business Copy XP Use Business Copy XP to maintain array-internal copies of all user data on the array for data on open systems such as UNIX and PC servers. Business Copy XP creates a pair of P-VOL and S-VOL, both of which are logical volumes in the same array. Pairs that Business Copy XP creates are called Business Copy XP pairs. RAID-protected S-VOLs are created within the same array as the P-VOL. Use Business Copy XP to create up to three S-VOLs for a P-VOL.
Overview of copy solutions
2 Snapshot XP functions Snapshot XP creates pairs consisting of a P-VOL and S-VOL. When creating a pair, Snapshot XP uses a V-VOL as the pair’s S-VOL. In addition, you can manage the P-VOL’s snapshot data by copying the data to an area called the pool. This chapter describes the volumes Snapshot XP uses first, and then describes Snapshot XP functions. Volumes Snapshot XP uses Snapshot XP uses the P-VOL, S-VOL, and pool-VOL.
Table 3 Requirements for Snapshot XP S-VOLs (continued) Item Requirement Maximum number 8,191 For more information about the maximum number of Snapshot XP pairs you can create, see ”Calculating the number of Snapshot XP pairs you can create” on page 22.
can create 128 pools in an array. Figure 2 illustrates the relationship between Snapshot XP pairs and pools. Figure 2 Snapshot XP pair and pool mechanism You must create a pool when using Snapshot XP. You can add pool-VOLs registered in a pool, but cannot delete pool-VOLs during the operation. In addition, to delete the pool itself, you must delete all snapshot data in the pool. CAUTION: A pool’s capacity equals the total capacity of the pool-VOLs registered in the pool.
2. Create a Snapshot XP pair. 3. Store the snapshot data in the pool. 4. Execute the command again to recognize the device. NOTE: • Servers (including RAID Manager XP) show V-VOLs with emulation type 0 (for example, OPEN-0V). When creating a Snapshot XP pair, specify the volume with emulation type 0, such as OPEN-0V, as the S-VOL. • Before creating a V-VOL, you must define a V-VOL group. The emulation type of the V-VOLs and the emulation type of the VDEV for a V-VOL group are OPEN-V.
NOTE: If you restore the pair when data is written in the S-VOL instead of the snapshot data, data in the S-VOL is written back to the P-VOL. If there are problems with the P-VOL data during a failure, you can restore the P-VOL to the normal state when the snapshot data was stored by executing restoration. To restore a Snapshot XP pair, use a RAID Manager command. For more information, see ”Restoring Snapshot XP pairs” on page 55.
• The required time for deleting snapshot data or Snapshot XP pairs is several seconds, and sometimes more than 10 minutes. The time increases if the deleted pair uses a large amount of the pool or if multiple pairs are deleted at one time. • The more disk adaptors used in the array, the shorter the time required for deleting snapshot data or Snapshot XP pairs.
3 Requirements for Snapshot XP operations This chapter describes requirements for using Snapshot XP, installing Snapshot XP, and calculating the number of pairs that Snapshot XP can create. Requirements for using Snapshot XP Table 5 Requirements for using Snapshot XP Item Requirement RAID level RAID1, RAID5, or RAID6 Shared memory Install shared memory for the differential table on the base board. Configure shared memory so you can create the V-VOL management area in the shared memory.
Uninstalling Snapshot XP 1. Delete all Snapshot XP pairs. 2. Delete all pools. 3. Delete all V-VOLs. 4. Uninstall Snapshot XP. For more information about deleting pairs, pools, and V-VOLs, see ”Snapshot XP operations” on page 37. Calculating the number of Snapshot XP pairs you can create The number of Snapshot XP pairs you can create for an array depends on the number of differential tables, V-VOL management area’s shared memory capacity, or number of pair tables.
Therefore, you can create a maximum of 6,826 Snapshot XP pairs.
Using the number of pair tables Hitachi FlashCopy Mirroring Version 2 and Snapshot XP pairs use pair tables to store control information needed to manage pairs. To create an Hitachi FlashCopy Mirroring Version 2 or Snapshot XP pair, you need one pair table for each pair. Usually, up to 32,768 pair tables are available in one array.
4 Using Snapshot XP This chapter describes procedures for using Snapshot XP. The first section describes the flow of Snapshot XP processes. The next section describes how the status of a Snapshot XP pair changes while using Snapshot XP. The other sections provide information needed to create pools and switch off the array’s power supply after you start using Snapshot XP.
If a failure occurs when restoring a Snapshot XP pair, the pair’s snapshot data is written back to the P-VOL. You might not be able to restore the pair if another pair is being restored. For more information about the status of Snapshot XP pairs and operations on pairs, see ”Status of Snapshot XP pairs” on page 26. Status of Snapshot XP pairs When creating or splitting a Snapshot XP pair, the pair status changes. Figure 4 shows the transition of the Snapshot XP pair status.
3. Issue the pairsplit command on the Snapshot XP pair in PAIR status to store the snapshot data in the pool. When the operation completes, the pair status changes to PSUS. NOTE: If the pool capacity exceeds the threshold when a Snapshot XP pair is in PSUS status, the pair status changes to PFUS in RAID Manager XP. For more information, see the HP StorageWorks RAID Manager XP user guide. 4. To delete only snapshot data and leave the Snapshot XP pair, issue the pairresync command for the PSUS or PFUS pair.
Use RAID Manager XP commands to operate Snapshot XP pairs. However, whether the operations complete normally or not depends on the pair status. Table 7 shows the pair status and results of the RAID Manager commands.
• For one snapshot data If the same P-VOL area is updated only once, copy capacity is equal to the capacity of data written between storing and deleting snapshot data. For example, to make a backup using Snapshot XP, you can back up S-VOL data after storing the snapshot data, and then delete the snapshot data. In this case, only data written during the backup must be copied to the pool, and there is only one snapshot data. Therefore, you can make a backup with a pool with small capacity.
You can usually use the pools and Snapshot XP pairs you used before switching off the power. However, since the array checks the status of pools and pool volumes, if pool volumes are blocked at that time, the pool is blocked and the status of Snapshot XP pairs changes to PSUE. When this occurs, you must recover the pools after switching on the power. For more information, see ”Recovering blocked pools” on page 68.
NOTE: • You need LUN Security XP Extension to set the Read Only attribute, Protect attribute, S-VOL Disable, or VMA. For more information, see the HP StorageWorks LUN Security XP Extension user guide. • You need RAID Manager XP to set extents, Zero Read Capacity, or Invisible attribute. For more information, see the HP StorageWorks RAID Manager XP user guide.
The relationship between the Snapshot XP pair status and Business Copy XP operations is shown in Table 11 and Table 12.
For more information about Business Copy XP pair status and operations, see the HP StorageWorks Business Copy XP user guide for the XP12000/XP10000/SVS200. Combining Snapshot XP with Continuous Access XP or Continuous Access XP Journal When the Snapshot XP P-VOL and the Continuous Access XP or Continuous Access XP Journal pair volume are shared, the relationship between the Continuous Access XP or Continuous Access XP Journal pair status and Snapshot XP operations is shown in Table 13 and Table 14.
Table 15 Continuous Access XP/Continuous Access XP Journal operations when Snapshot XP P-VOL and Continuous Access XP/Continuous Access XP Journal P-VOL are shared (continued) Continuous Access XP/ Continuous Access XP Journal operations Snapshot XP pair status1 COPY PAIR PSUS SMPL(PD) COPY(RS) COPY(RS-R) PSUE Resynchronizing pairs (pairresync) OK OK OK OK OK No OK Deleting pairs (pairsplit -S) OK OK OK OK OK OK OK Switching to remote site (horctakeover) OK OK OK OK OK No OK
• COPY • SMPL(PD) • COPY(RS) • COPY(RS-R) • PSUE NOTE: PSUE. You can set S-VOL Disable on the P-VOL even if the pair status is COPY, SMPL(PD), COPY(RS), or For more information about setting the access attribute, see the HP StorageWorks LUN Security XP Extension user guide.
Using Snapshot XP
5 Snapshot XP operations This chapter describes Snapshot XP operations and panes. Displaying the Business Copy XP main pane 1. Launch Command View XP or XP Remote Web Console. 2. Click the Business Copy ( ) button. The Business Copy XP main pane appears. Figure 5 Business Copy XP main pane NOTE: Although the Business Copy XP main pane displays information about Business Copy XP and Snapshot XP pairs, this section only explains items related to Snapshot XP pairs.
• Volume list (upper-right area of pane): Displays Business Copy XP or Snapshot XP pairs on the port, host group, iSCSI target, or LUN selected in the tree. You can sort volumes by any column heading in the volume list. • Preset list: Displays operations that have been performed in the Business Copy XP main pane, but have not been applied to the array. To apply operations displayed in the Preset list to the array, click Apply. For more information, see ”Preset List” on page 40.
• Port: P-VOL’s port ID (cluster and channel number). • G-ID: Group number of the P-VOL’s host group or iSCSI target. • LUN: P-VOL’s CU:LDEV (control unit image:logical device ID). NOTE: An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external LU. For more information about external LUs, see the HP StorageWorks External Storage XP user guide. • MU: Snapshot XP pair’s snapshot ID. If the pair is in SMPL status, three hyphens (---) appear.
• CLPR(S): S-VOL’s cache logical partition. • Shortcut menu: When you select Snapshot XP pair volumes in the volume list and right-click, a shortcut menu appears. Table 18 Shortcut menu in volume list Command Function Detail Opens the Detail pane (Figure 19). Pairsplit-S Opens the Pairsplit-S pane (Figure 17). S-Vol Path Opens the S-Vol Path pane (Figure 20). Display Filter Opens the Display Filter pane (Figure 8). NOTE: • Grayed out commands are for Business Copy XP pairs.
• LUN: P-VOL’s CU:LDEV (control unit image:logical device ID). NOTE: An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external LU. For more information about external LUs, see the HP StorageWorks External Storage XP user guide. • MU: Snapshot XP pair’s snapshot ID. If the pair is in SMPL status, --- appears. For more information about what is displayed for Business Copy XP pairs, see the HP StorageWorks Business Copy XP user guide for the XP12000/XP10000/SVS200.
2. Click Display Filter, or right-click the volume list, and select Display Filter. The Display Filter pane appears. Figure 8 Display Filter pane (Snapshot XP tab selected) NOTE: • For more information about the Business Copy XP tab on the Display Filter pane, see the HP StorageWorks Business Copy XP user guide for the XP12000/XP10000/SVS200. • Filter settings are only effective within the current operations in the Business Copy XP main pane.
NOTE: If the check box is not selected, all check boxes in both tabs are grayed out. • Business Copy tab: This tab is for Business Copy XP pairs. For more information, see the HP StorageWorks Business Copy XP user guide for the XP12000/XP10000/SVS200. • Snapshot XP tab: Check boxes indicate the status of Snapshot pairs displayed. If you select or clear a check box, Snapshot XP pairs in that status are displayed or hidden in the volume list.
NOTE: The capacity of the pool management block in use must be less than its total capacity. • Pool tree: Pools in the array are displayed in a tree format. The following icons appear in the tree. Icon Description Array or Snapshot XP Pool in normal status Pool whose usage rate exceeds the threshold Blocked pool Normal pool (in the process of deleting) Blocked pool (in the process of deleting) • Shortcut menu: When you select icons in the Pool tree and right-click, a shortcut menu appears.
• Free LDEVs: From volumes in the CU selected in the CU drop-down list, volumes that can be specified as pool-VOLs. • CU:LDEV: Volume’s CU and LDEV number NOTE: An LDEV number ending with # (for example, 00:01#) indicates the LDEV is an external LU. For more information about external LUs, see the HP StorageWorks External Storage XP user guide.
2. On the Pool pane (Figure 9), right click Snapshot XP in the Pool tree, and select New Pool. The New Pool pane (Figure 10) appears. 3. Enter the pool ID in the Pool ID text box. NOTE: You can enter only a whole number from 0 to 127 in this text box. Do not enter any number that is already used for another pool. 4. Select the pool usage rate threshold from the Threshold list. CAUTION: If the pool’s usage rate exceeds the threshold, you cannot create new Snapshot XP pairs.
14.Click OK. The confirmation message closes, and the new pool information is applied to the array. Figure 10 New Pool pane • Pool ID: Pool ID. Enter a number from 0 to 127. NOTE: Do not enter a pool ID that another pool is already using. If you enter a pool ID that another pool is already using and click Set, an error message appears. In that case, enter a different number for the new pool ID. • Threshold: Threshold of the pool usage rate between 20 and 95. NOTE: The threshold unit is percent (%).
6. Click OK. The confirmation message closes, and the setting change is applied to the array. Figure 11 Change Pool Information pane Items in the Change Pool Information pane are the same as those in the New Pool pane. However, in the Change Pool Information pane, you cannot enter or select items other than the Threshold list. For more information about items in the Change Pool Information pane, see ”Creating new pools” on page 45.
You must delete all pools in the array to initialize the V-VOL management area. If pools exist in the array, only the pool management block is initialized instead of the whole V-VOL management area. For more information, see ”Initializing pool management blocks” on page 49. 1. Change Command View XP or XP Remote Web Console to Modify mode.
• V-VOL group tree (left area of the pane): V-VOL groups in the array. The following icons appear in the tree. Icon Description Array V-VOL group V-VOL group (in the process of deleting) VDEV • Shortcut menu: When you select icons in the V-VOL group tree and right-click, a shortcut menu appears. Table 21 Shortcut menu in the V-VOL group tree Command Function New V-VOL Group Opens the New V-VOL Group pane (Figure 13). You can select this command only when you right-click an array icon.
NOTE: You can select or enter only a whole number from 1 to 8192 in V-VOL Group. Do not enter a number that is already used for another V-VOL group. 4. Select the V-VOL group’s emulation type from the Emulation Type list. 5. Select the CLPR number of the CLPR in which you want to register the V-VOL group from the CLPR list. 6. Click Next. The Create V-VOL wizard pane (1) (Figure 14) appears. 7. Select the V-VOL’s emulation type from the Emulation Type list. 8.
17. Click Next. The Create V-VOL wizard pane (3) (Figure 16) appears. 18.Check the settings. If there is no problem, click OK. The Create V-VOL wizard pane (3) closes, and the V-VOL pane appears. In the V-VOL pane, settings appear in blue italics. 19. Click Apply. A confirmation message appears. 20.Click OK. The confirmation message closes, and the new V-VOL information is applied to the array. Figure 13 New V-VOL Group pane • V-VOL Group: V-VOL group ID. Select or enter a whole number from 1 to 8192.
• Capacity: V-VOL’s capacity. If you selected MB from the Capacity Unit list, enter a whole number from 46 to 2097151. If you selected block, enter a whole number from 96000 to 4294967296. If you selected Cyl, enter a whole number from 50 to 2236962. • Number of V-VOL: Number of V-VOLs you want to add. Enter a whole number from 1 to 256. • Set button: dds V-VOLs to the V-VOL information setting list. • Delete button: Deletes selected V-VOLs from the V-VOL information setting list.
NOTE: • The value you specify as the interval between LDEV numbers counts only available LDEV numbers and skips those that are not selectable. • Even when you use multiple CUs, LDEV numbers are assigned according to the setting in the Interval list. • CU number of another SLPR is used.: Used to select the CU numbers of an SLPR other than the SLPR you are now in. • Back button: Returns to the Create V-VOL wizard pane (1) while maintaining settings in this pane.
3. Click OK. The selected V-VOL group’s icon changes to an icon indicating the deleting process. 4. Click Apply. A confirmation message appears. 5. Click OK. The confirmation message closes, and the V-VOL group is deleted in the array. NOTE: You cannot delete the V-VOL if it is used as a Snapshot XP pair’s S-VOL. To delete a V-VOL used as an S-VOL, first delete the pair. Creating Snapshot XP pairs Use the RAID Manager XP paircreate command to create Snapshot XP pairs.
Deleting snapshot data Use the RAID Manager XP pairresync command to delete snapshot data. You can store up to 64 snapshot data per P-VOL. Therefore, to store new snapshot data for a P-VOL that already has 64 snapshot data, you must delete old snapshot data. If you delete snapshot data, free area in the pool increases. To delete snapshot data, issue the pairresync command on Snapshot XP pairs in PSUS status.
7. Click OK. The confirmation message closes, and the pair is deleted from the array. Figure 17 Pairsplit-S pane • Volume list: Information about the Snapshot XP pairs you are deleting.
8. Click Apply. A confirmation message appears. 9. Click OK. The confirmation message closes, and the pair is deleted from the array. Figure 18 Snapshot XP pane • Tree (left area of pane): Pools in the array. The following icons appear in the tree.
• Y: Total capacity of pool association information, including capacity of pool association information in use • Pool Mng. Block: X GB / Y GB • X: Capacity of pool management blocks in use • Y: Total capacity of the management blocks, including capacity of pool management blocks in use NOTE: Pool association information and a pool management block are elements of the V-VOL management area. You need the capacity of these two elements to calculate the number of Snapshot XP pairs you can create.
NOTE: If you select Detail when you selected a Business Copy XP pair, the Detail pane is different than when you select a Snapshot XP pair. For more information, see the HP StorageWorks Business Copy XP user guide for the XP12000/XP10000/SVS200. Figure 19 Detail pane for Snapshot XP pair • P-Vol: P-VOL’s CU and LDEV numbers. • Type: P-VOL’s emulation type. • Capacity(MB): P-VOL’s capacity. The unit is megabyte (MB). • Blocks: Number of blocks the P-VOL uses.
2. Select and right-click a Snapshot XP pair in the volume list, and select S-Vol Path. The S-Vol Path pane appears.
NOTE: To update information on the History pane, click Refresh. Figure 21 History pane The upper area of the History pane lists the operation history of Business Copy XP pairs. For more information about the operation history of Business Copy XP pairs, see the HP StorageWorks Business Copy XP user guide for the XP12000/XP10000/SVS200. The lower area lists the operation history of Snapshot XP pairs. • Time: Date and time (YYYY/MM/DD hour/min/sec) when a Snapshot XP pair or volume operation was performed.
Table 22 Snapshot XP history reference codes and messages Code Message Description 0x2041 INITIALIZE END Initialization ended normally. 0x2042 INITIALIZE ENDED ABNORMAL Initialization ended abnormally.
Snapshot XP operations
6 Troubleshooting This chapter describes general troubleshooting for using the Command View XP or XP Remote Web Console and Snapshot XP. General troubleshooting You are responsible for the operations and usual maintenance of the Command View XP management station or XP Remote Web Console.
Table 23 Troubleshooting for Snapshot XP (continued) Problem Cause and solution Pool information is not displayed. Causes: • Pool is blocked. Solutions: • A pool is blocked. Implement the measures in ”Recovering blocked pools” on page 68. Causes: • Pool-VOLs are blocked. Solutions: • Pool usage rate exceeds the threshold. Implement the measures in ”Recovering blocked pools” on page 68. In addition, after the problem is solved, you must complete the SIMs.
Table 23 Troubleshooting for Snapshot XP (continued) Problem Cause and solution Cannot create Snapshot XP pairs. Causes: • • • There are not enough differential tables to create pairs. Conditions to create the pair are not fulfilled. Volumes specified to create the pair are in SMPL(PD) status because the pair is being deleted. Solutions: • • • • Snapshot XP pairs are not displayed in the volume list. Secure enough differential tables to create the Snapshot XP pairs.
Table 23 Troubleshooting for Snapshot XP (continued) Problem Cause and solution When the host computer tried to access the port, an error occurred and the host could not access the port. Causes: • Some ports go offline because the access to the volume on the other ports is rejected. Solutions: • • Wait for a while, and try the operation again. If the application software is installed in the host to monitor the volume, terminate the application.
Recovering V-VOLs When the V-VOL is blocked, contact your HP account support representative. Completing pool-related SIMs When the pool’s usage rate exceeds the threshold or when the pool is blocked, the following Service Information Messages (SIMs) occur: • When the usage rate of the pool exceeds the threshold: Reference code 6000XX • When the pool is blocked: Reference code 6001XX XX indicates the pool ID. For more information about SIM reference codes, contact your HP account support representative.
Troubleshooting
Index A array capacity 12 audience, documentation 7 B battery backup 30 blocked pools, recovering 68 Business Copy XP 12, 37 C calculating maximum number of pairs 22 pool usage 23 capacity, arrays 12 capacity, pool 17, 27, 28 Command View XP, troubleshooting 65 conventions document 8 text symbols 8 copy processing, temporarily stopping 19 Copy Threshold option 19 COPY(RS-R) status 27, 55 customer support 8 D data copying operations 12 deleting pairs 19, 25, 27, 56 pools 17, 48 V-VOLs 54 Detail pane 59 di
deleting 17, 48 deleting pairs from 57 settings 47 status 44, 58 storing data 18 storing snapshot data 55 troubleshooting 66 pool-VOLs blocked 68 capacity 17, 27, 28 creating pools 16 data copying operations 12 deleting 17 information about 44 requirements 16 ports, deleting pairs 56 power supply, switching off 29 prerequisites 7 Preset list 40, 59 primary volumes.
X XP Remote Web Console, troubleshooting 65 Snapshot XP user guide 73
