HP P9000 for Compatible XRC User Guide Abstract This guide describes and provides instructions to use HP P9000 Compatible Extended Remote Copy Software on HP P9000 disk arrays. The intended audience is a storage system administrator or authorized service provider with independent knowledge of HP P9000 disk arrays and the HP Remote Web Console.
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Contents 1 Overview of Compatible XRC......................................................................5 Function overview.....................................................................................................................5 Sessions.............................................................................................................................5 TSO commands...................................................................................................................
Conventions for storage capacity values....................................................................................22 Typographic conventions.........................................................................................................22 A Controlling the amount of write data...........................................................24 When block option is set to cache level.....................................................................................
1 Overview of Compatible XRC Unless otherwise specified, the term P9000 in this guide refers to the following disk array: • P9500 Disk Array The GUI illustrations in this guide were created using a Windows computer with the Internet Explorer browser. Actual windows may differ depending on the operating system and browser used. GUI contents also vary with licensed program products, storage system models, and firmware versions.
is not performed due to the failure. However, the write order (sequence) is maintained so that the write process can be reinitiated after recovery. A session is further divided into internal sessions called storage control (SC) sessions per each volume. SDM reads the data written to the P9500 storage system at the primary site in order of time stamp in each SC session. SDM checks the time stamp of each SC session, and determines in what order the data is written to the secondary volumes.
Figure 2 Channel Extender connection configuration for Compatible XRC Configuration 7
2 Requirements and restrictions This chapter provides system requirements and restrictions for using Compatible XRC. 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. • Secondary host The secondary host requires the System Data Mover (SDM) host software for remote copy operations.
Table 1 Features supported by Compatible XRC 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. Not supported Supported Fix utility Fix or Float of Utility DEV setting feature.
Performance considerations Note the following important performance considerations for Compatible XRC operations: • Block size. Consider the block sizes when configuring the SC sessions: do not issue too many write I/Os with large blocks to one SC session. • SDM tuning. The performance of Compatible XRC is affected by the performance of SDM. You must tune the SDM to achieve the desired performance. For information on SDM tuning, see the IBM document Implementing ESS Copy Services on S/390.
Table 5 Behavior of storage system - block option is “Cache Level” Compatible XRC Options Behavior of the P9500 disk array Option Setting Do not Block is specified by SDM and Do not Do not Block is Not specified by SDM (Block Block (Volume Level) is enabled is specified) or Do not Block (Volume Level) is disabled Level 1 SIM Enable The disk array does not report a SIM to the If Level 1 Sleep is enabled, the disk array host when the amount of used sidefile reports a SIM to the host when the amount cap
3390-A and 3390-M devices If you want to use a 3390-A or a 3390-M device as a Compatible XRC P-VOL or S-VOL, you must make sure the System Data Mover (SDM) softwareaccessing the array at the secondary site has the following PTF (program temporary fix): [PTF] UA18053: SUPPORT XRC VOLUME SIZE UP TO 65520 CYL The 3390-A or 3390-M devices cannot be used as P-VOLs or S-VOLs in Compatible XRC operations if this PTF has not been applied to the SDM.
3 Interoperability with other products and functions This chapter provides information about Compatible XRC interoperability with other products and functions. Volume sharing between Compatible XRC and other copy functions The P9500 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.
Figure 4 Volume Functioning as Compatible XRC P-VOL and Cnt Ac-S Z M-VOL Volume Functioning as Compatible XRC S-VOL and Cnt Ac-S Z M-VOL The following shows the configuration in which a volume is functioning as both a Compatible XRC S-VOL and a Cnt Ac-S Z M-VOL. In this configuration, data is copied from the primary site to the first secondary site using Compatible XRC, and it is copied from the first secondary site to the second secondary site using Cnt Ac-S Z.
Figure 7 Volume Functioning as Compatible XRC S-VOL and BC Z S-VOL Volume as Compatible XRC P-VOL and BC Z S-VOL, another volume as Compatible XRC S-VOL and BC Z S-VOL The following shows the configuration in which one volume is functioning as both a Compatible XRC P-VOL and a BC Z S-VOL (source volume) and another volume is functioning as both a Compatible XRC S-VOL (secondary volume) and an BC Z S-VOL (source volume).
Volume functioning as Compatible XRC S-VOL and Compatible FlashCopy S-VOL The following shows the configuration in which a volume is functioning as both a Compatible XRC S-VOL (secondary volume) and a Compatible FlashCopy S-VOL (source volume). In this configuration, data is copied from the primary site to the secondary site using Compatible XRC, and it is copied within the secondary site using Compatible FlashCopy.
4 Performing Compatible XRC operations This chapter provides instructions for performing Compatible XRC operations. Launching Compatible XRC To use Compatible XRC, log on to the P9500 and display the Remote Web Console main window. Open Compatible XRC window from the Remote Web Console main window. Procedure 1 To open the Compatible XRC window: 1. 2. Log on to the P9500 Log into Remote Web Console. The Remote Web Console main window appears. 3.
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. Click Change on the pop-up menu. The Change Option window appears. 3. 4. In the Option Change window, change the settings of the Compatible XRC. When you have finished changing the settings, click OK.
5 Troubleshooting This chapter provides troubleshooting information for Compatible XRC. General troubleshooting For troubleshooting errors encountered during the Compatible XRC operation, see the HP P9000 Remote Web Console Messages. For troubleshooting the general errors of Remote Web Console, see the HP P9000 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 7 Compatible XRC console messages and troubleshooting (continued) Console message Description cache before resuming the Compatible XRC pairs. If you delete Compatible XRC pairs after the time-out error occurs, the session might remain on the disk controller side. Execute the LISTSESS command to confirm whether the session remains. If the session remains, execute the TERMSESS command to terminate the session.
6 Support and other resources Contacting HP For worldwide technical support information, see the HP support website: http://www.hp.
• http://www.hp.com/support/downloads • http://www.hp.
CAUTION: IMPORTANT: NOTE: TIP: Indicates that failure to follow directions could result in damage to equipment or data. Provides clarifying information or specific instructions. Provides additional information. Provides helpful hints and shortcuts.
A Controlling the amount of write data This appendix describes how to control the amount of write data the storage system performs according to the sidefile capacity. When block option is set to cache level When the Cache Level 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.
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 (i.e., level-1 threshold) is exceeded.
B Compatible XRC GUI reference This appendix describes the Compatible XRC window and the Change Option window. Compatible XRC window The following table describes the items in the Compatible XRC window. 26 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.
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 describes 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 Do not Block (Volume Level) Sets whether the storage system controls the amount of write I/Os to the specified volume. • Enable The storage system does not control the amount of data to be written to the specified volume. Write I/Os from hosts are not put in a wait status. When Block Option is set to Volume Level, Enable is set. For details, see “Troubleshooting” (page 19). • Disable The storage system controls four levels of the amount of write data according to the sidefile capacity.
Glossary ATM Asynchronous transfer mode. BC P9000 or XP Business Copy. An HP application that provides volume-level, point-in-time copies in the disk array. BC Z The version of Business Copy that supports mainframe volumes. bit The basic unit of data in a binary numbering system (binary digit), represented by a 0 or a 1. Eight bits equals one byte. CLPR Cache logical partition. CNT Computer network technologies. Cnt Ac-S P9000 or XP Continuous Access Synchronous software.
Index Block option, 10 Business Copy for Mainframe using with Compatible XRC, 14 conventions, 22 related information, 21 documentation HP website, 21 providing feedback, 21 Double Compatible XRC Pairs, 13 C E Cache logical partition, multiples, 11 Channel extenders, 6, 8 CNT extender, 9 Commands Reverse Copy and Quick Restore, 13 TSO commands, 6 XADDPAIR, 12 XDELPAIR, 12 Compatible XRC channel extenders, 6 Compatible XRC window, 17 concurrent copy sessions, 9 overview of operations, 24 setting options,
S X SC sessions, 6 SCP-SCI, 11 Secondary volumes, 5, 6 Sessions Compatible XRC, 9 concurrent copy, 9 Settings Compatible XRC options, 17 Sidefile cache memory, 5 capacity, 10 data, 5 puncture, 24 Sleep set to enable, 24 wait cmd retry, 11 wait command, 10 wait threshold, 10 Source volume, 15 storage capacity values conventions, 22 Storage control sessions, 6, 12 Subscriber's Choice, HP, 21 symbols in text, 22 Sysplex timer, 6, 8 System data mover, 12 requirements, 8 System data mover, 5 XADDPAIR operatio
