HP XP7 for Compatible XRC User Guide Abstract This document describes and provides instructions for using the Compatible XRC software on a HP XP7 Storage system.
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Contents 1 Overview of Compatible XRC......................................................................5 Introducing Compatible XRC......................................................................................................5 Features of Compatible XRC..................................................................................................5 Sessions.............................................................................................................................
Subscription service............................................................................................................26 Documentation feedback....................................................................................................26 Related information.................................................................................................................26 HP websites..............................................................................................................
1 Overview of Compatible XRC This topic provides an overview of the Compatible XRC (Compatible XRC) feature and configuration. Introducing Compatible XRC In Compatible XRC operations, the data written from the host to the primary volume in the primary HP XP7 Storage disk array is also written temporarily to a section of cache memory in the HP XP7 Storage system called a sidefile.
SDM manages definitions of sessions and SC sessions. They are defined for session IDs and volumes by TSO command in the storage system. TSO commands The following settings concerning XRC operations are defined by the Time Sharing Option (TSO) commands issued to the storage system from the host system.
System Configuration 7
2 Requirements and restrictions This topic provides system requirements and restrictions for using Compatible XRC. Set up and requirements System requirements The Compatible XRC system requirements are: • Primary host If the system in the primary site consists of several hosts, a SYSPLEX timer is required in the primary host to provide a common time reference for the I/O time-stamping function.
Supported XRC functions in XRC2 and XRC3 The following table lists the supported Compatible XRC features in IBM XRC functions (XRC2 and XRC3). Feature Description XRC2 XRC3 DEV blocking Sidefile threshold tuning feature for each volume. Supported Supported Unplanned outage Differential copy feature for unplanned outage achieved by the differential bit management in the storage system. Not supported Supported CNT MULTI path Alternate path retry feature for CNT USD1 connections.
The number of Concurrent Copy (CC) and Compatible XRC sessions for each volume depends on the combination of CC and XRC (XRC2 and XRC3). The following table shows the number of sessions for each volume.
Compatible XRC Options Behavior of the HP XP7 Storage disk array Option Setting "Donot Block" is Specified by SDM Disable The storage system does not The storage system does not report an SIM to the report an SIM to the host when host when the usage of sidefile exceeds the sleep the usage of sidefile exceeds wait threshold. the sleep wait threshold.
Compatible XRC Options Behavior of the HP XP7 Storage disk array Option Setting Donot Block is specified by SDM and Donot Donot Block is Not specified by SDM (Block Block (Volume Level) is enabled is specified) or Donot Block (Volume Level) is disabled Level 2 Suspend Enable Level 2 Suspend occurs when the amount of used sidefile capacity exceeds the level 2 threshold.
Maintenance When a maintenance operation is needed while Compatible XRC is being used, I/Os for Compatible XRC pair volumes or Compatible XRC itself should be stopped before the maintenance operation. If a maintenance operation must be done while Compatible XRC is being used, before you start the maintenance operation, confirm that the usage of the Sidefile monitor is less than 20% of total Cache capacity by monitoring each combination of MPPK and CLPR usage.
3 Interoperability with other products and functions This topic provides information about Compatible XRC interoperability with other products and functions. Volume sharing between Compatible XRC and other copy functions The HP XP7 Storage system supports concurrent operations of Compatible XRC with other copy functions. The following table indicates whether Compatible XRC volumes can be shared with other copy functions.
Using Compatible XRC with Continuous Access Synchronous Z The HP XP7 Storage system supports the use of Compatible XRC with Continuous Access Synchronous Z to maintain three copies of critical data at your primary and/or secondary sites for disaster recovery purposes. Compatible XRC P-VOL functioning as Cnt Ac-S Z primary volume The following figure shows the configuration in which a volume is functioning as both a Compatible XRC P-VOL and a Cnt Ac-S Z primary volume.
Compatible XRC S-VOL functioning as BC Z primary volume The following figure shows the configuration in which a volume is functioning as both a Compatible XRC S-VOL (secondary volume) and a BC Z primary volume. In this configuration, data is copied from the primary site to the secondary site using Compatible XRC, and then it is copied within the secondary site using BC Z.
primary site using Compatible FlashCopy, and it is copied from the primary site to the secondary site using Compatible XRC. Compatible XRC S-VOL functioning as Compatible FlashCopy source volume The following figure shows the configuration in which a volume is functioning as both a Compatible XRC source volume and a Compatible FlashCopy S-VOL (source volume).
Configuration for the XRC Multiple Reader function We recommend that the utility volume in a CU for the XRC session and an alias volume for Compatible Hyper PAV be owned by the same MP blade.
Reader function, you can configure the LDEV ownership and Compatible PAV in several different ways. • Configuring one MP blade to own all LDEVs in a CU. Using this configuration, you can create a record set for the data writing and process the Read Record Set with the same MP blade. This balances the worload in the HP XP7 Storage system across the MP blades.
• Using volumes in a CU with several sessions. To use volumes in a CU with several sessions, define the configuration as follows: ◦ Allocate all alias volumes allocated by Compatible PAV to the utility volumes in any sessions. ◦ Consolidate all utility volumes for each session into one MP blade. In this configuration, the record sets are created in multiple MP blades, but the Read Record Set operation is performed in one blade.
• You can use Compatible XRC with Compatible FlashCopy SE. For details, see the topic on interoperability with other products and functions in the HP XP7 for Compatible FlashCopy Mirroring User Guide. • You can use Thin Provisioning Z or Smart Tiers Zfor the Compatible XRC P-VOL and S-VOL.
4 Using Compatible XRC This topic provides instructions for using the features of Compatible XRC. Launching Compatible XRC Procedure 1 To open the Compatible XRC window: 1. 2. Log on to the HP XP7 Storage system. Log in to Remote Web Console. The Remote Web Console main window appears. 3. On the Remote Web Console menu bar, click Action > Mainframe Connection > XRC. The Compatible XRC window appears. 4. Change to Modify mode.
10. Click OK. The settings are reflected in the XRC option list in the Compatible XRC window. This completes the setting of the Compatible XRC options. For instructions on using Remote Web Console, see the HP XP7 Remote Web Console User Guide. Related topics • Page 32 Changing the settings in the preview list Use the XRC Option window to change the settings of the Preview list. 1. On the Preview list in the XRC Option window, right-click the CLPR for which you want to change the option settings. 2.
5 Troubleshooting This topic provides troubleshooting information for Compatible XRC. General troubleshooting For troubleshooting errors encountered during the Compatible XRC operation, see the HP XP7 Remote Web Console Messages. For troubleshooting general errors of Remote Web Console, see the HP XP7 Remote Web Console User Guide. Console messages The table shows how to solve the problems when the console messages appear while you are operating the Compatible XRC.
Table 1 Compatible XRC console messages and troubleshooting (continued) Console message Description ANTA5107E (RC=9014, REAS=604 or REAS=608) If the ANTA5107E (RC=9014, REAS=604 or REAS=608) console message appears during the XADDPAIR operation, the Compatible XRC software might not be installed on the HP XP7 Storage system. If Compatible XRC is not installed, install it.
6 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 2 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: 28 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 Controlling the amount of write data This topic describes how to control the amount of write data the storage system performs according to the sidefile capacity. When the Donot Block option is enabled When the Cache Level Donot Block option is selected, depending on the sidefile capacity, the storage system performs one of the following three levels for controlling the amount of write data.
SDM; the default threshold is 0x500.When Level 1 Sleep is set to Disable, write I/Os to volumes are not put in a wait status. • Level 1: This level of control is performed when the sidefile capacity is equal to or larger than the level-1 threshold, and is smaller than the level-2 threshold. Write I/Os to volumes are put in a wait status by command retry when the sleep wait threshold (that is, level-1 threshold) is exceeded.
B Compatible XRC GUI reference This topic describes the Compatible XRC window and the Change Option window. Compatible XRC window The following is the Compatible XRC window. The following table shows the items in the Compatible XRC window. Item Description Compatible XRC option list CLPR CLPR number. LV2 THD Threshold shown in Level 2 Threshold in the Change Option window. Block Option Setting shown in Block Option in the Change Option window.
Related topics • Page 22 • Page 23 Change Option window The following is the Change Option window. To open the Change Option window, right-click the desired CLPR in the Compatible XRC option list, and then select Change Option. The following table shows the items in the Change Option window. Item Description CLPR list Select the desired CLPR. The same setting is applied. Check this box to apply the settings to all CLPRs. Clear this box to apply the settings only to the selected CLPR.
Item Description made: When Volume Level is selected, Enable is set to Donot Block (Volume Level), Disable for Level 1 is set to Sleep, and Disable for Level 2 three is set to Suspend. • Cache Level - disables the "Sleep"- "Wait" command retry according to the threshold for the number of record sets for each volume. The storage system controls the amount of three levels of write data based on the sidefile capacity. For details, see (page 29).
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 specified by SDM, 11 B Block option, 11 Business Copy for Mainframe using with Compatible XRC, 15 C Cache logical partition, multiples, 12 Channel extenders, 6, 8 CNT extender, 9 Commands reverse copy and quick restore, 14 xaddpair, 12 xdelpair, 12 Commns TSO commands, 6 Compatible XRC channel extenders, 6 Compatible XRC window, 22 concurrent copy sessions, 9 overview of operations, 29 setting options, 22 sharing volumes, 14 system requirements, 8 troubleshooting, 24 using TSO commands, 6 using with
Sidefile cache memory, 5 capacity, 10 data, 5 puncture, 29 Sleep set to enable, 29 wait command, 10, 11 wait threshold, 10 Source volume, 16 storage capacity values conventions, 27 Storage control sessions, 5 subscription service, HP, 26 symbols in text, 28 Sysplex timer, 6, 8 System data mover, 12 requirements, 8 System data mover, 5 T technical support HP, 26 service locator website, 27 text symbols, 28 Time-stamping, 6 Troubleshooting Compatible XRC, 24 Tuning the SDM, 10 typographic conventions, 27 U
