PowerHA SystemMirror for IBM i Cookbook - IBM …

1 CoverPowerHA SystemMirror for IBM i CookbookHernando BedoyaAbdell Ali-DarwishIngo DimmerSabine JordanKyoSeok KimAkinori MogiNandoo NeerukondaTomasz PielaMarc RauzierTake advantage of PowerHA to configure and manage high availabilityFind guidance on planning and implementing PowerHABenefit from the latest PowerHA solution enhancementsInternational Technical Support OrganizationPowerHA SystemMirror for IBM i CookbookJanuary 2012SG24-7994-00 Copyright International Business Machines Corporation 2012. All rights to Government Users Restricted Rights -- Use, duplication or disclosure restricted by GSA ADP ScheduleContract with IBM Edition (January 2012)This edition applies to Version 7, Release 1, Modification 0 of IBM i (5770-SS1) and related licensed porgram : Before using this information and the product it supports, read the information in Notices on page ix. Copyright IBM Corp. 2012. All rights.

2 IxTrademarks ..xIBM Redbooks promotions .. xiPreface .. xiiiThe team who wrote this book .. xivNow you can become a published author, too! .. xviComments welcome.. xviStay connected to IBM Redbooks .. xviiPart 1. Introduction and background .. 1 Chapter 1. Introduction to PowerHA SystemMirror for i .. IBM i Business Continuity Solutions .. PowerHA SystemMirror for i availability capabilities .. PowerHA SystemMirror for i: 2011 enhancements .. Choosing a solution.. 9 Chapter 2. Implementing an independent auxiliary storage pool .. IASP technology .. Name space .. Relational Database directory .. Connections .. Object creation .. System-wide statement cache (SWSC) .. Creating an IASP .. Moving applications to an IASP .. Object considerations .. Accessing objects in an IASP .. Considerations for specific environments .. Steps for application migration.

3 33 Chapter 3. IBM i clustering.. Cluster .. Cluster nodes .. Device domain .. Cluster resource group .. Advanced node failure detection .. 43 Chapter 4. PowerHA architecture .. PowerHA technologies .. Switched disks .. Host-based replication (geographic mirroring) .. Storage-based replication .. Administrative domain.. ASP copy descriptions .. ASP sessions .. Start/end .. Changing attributes .. 61iv PowerHA SystemMirror for IBM i CookbookPart 2. Concepts and planning .. 65 Chapter 5. Geographic Mirroring.. Concept of geographic mirroring .. Synchronous geographic mirroring .. Synchronous geographic mirroring with synchronous mirroring mode .. Synchronous geographic mirroring with asynchronous mirroring mode .. Asynchronous geographic mirroring .. Switched disk for local HA and geographic mirroring for DR .. Switched disks between logical partitions.

4 Combining geographic mirroring and switched disks .. 78 Chapter 6. DS8000 Copy Services.. DS8000 storage concepts .. Hardware overview .. Array site .. Array .. Rank .. Extent pools .. Volumes .. Volume groups .. Host connections .. Logical subsystems.. Metro Mirror.. Metro Mirror overview .. Metro Mirror operations.. PPRC paths and links .. Metro Mirror and IBM PowerHA SystemMirror for i.. Global Mirror .. Global Mirror overview .. Global Mirror operations .. Global Mirror and IBM PowerHA SystemMirror for i .. LUN-level switching.. FlashCopy .. FlashCopy SE .. 111 Chapter 7. Storwize V7000 and SAN Volume Controller Copy Services .. Storwize V7000/SAN Volume Controller storage concepts.. Hardware overview .. Storage virtualization .. I/O processing .. Copy Services .. Metro Mirror.. Bandwidth thresholds.

5 Remote copy relationship states .. Consistency groups .. Global Mirror .. FlashCopy .. I/O indirection .. Background copy .. FlashCopy relationship states .. Thin-provisioned FlashCopy .. Multi-target and reverse FlashCopy .. 129 Contents vChapter 8. Planning for PowerHA .. Requirements for PowerHA .. Licensing considerations.. PRPQ ordering information .. Power Systems requirements .. Virtual I/O Server considerations .. Storage considerations .. PowerHA Copy Services Support considerations .. Global Mirror symmetrical and asymmetrical configurations.. FlashCopy NoCopy/full copy/incremental/reverse .. Sizing and performance considerations .. Geographic mirroring .. Virtual I/O Server .. Copy Service bandwidth .. FlashCopy space-efficient relation .. 155 Chapter 9. PowerHA user interfaces.. Command line .. The Work with Cluster (WRKCLU) command.

6 The Configure Device ASP command .. Configure Geographic Mirroring command .. PowerHA GUI .. Accessing the PowerHA GUI .. Managing the cluster.. Cluster Resource Services GUI .. High Availability Solution Manager GUI .. 165 Chapter 10. Advanced Copy Services for PowerHA .. Advanced Copy Services interface .. DS storage management .. FlashCopy on Global Mirror target site .. Metro/Global Mirror and TPC-R support .. Custom programming .. IBM i full-system FlashCopy replication .. 192 Part 3. Implementation examples and best practices.. 197 Chapter 11. Creating a PowerHA base environment .. Creating a cluster .. Setting up cluster monitors .. Creating an IASP .. Setting up an administrative domain .. 225 Chapter 12. Configuring and managing Geographic Mirroring .. Setting up geographic mirroring .. Managing geographic mirroring .. Administrative domain.

7 Planned switchover .. Deconfiguring geographic mirroring .. 260 Chapter 13. Configuring and managing DS8000 Copy Services .. Setting up IBM i DS8000 Copy Services.. Configuring IBM i DS8000 Metro Mirror (GUI and CL commands) .. Configuring IBM i DS8000 FlashCopy (CL commands) .. 294vi PowerHA SystemMirror for IBM i Configuring IBM i DS8000 Global Mirror (CL commands) .. Configuring IBM i DS8000 LUN-level switching .. Managing IBM i DS8000 Copy Services .. Switchover and switchback for a Metro Mirror or Global Mirror planned outage Using CL commands for DS8000 LUN-level switching .. Failing over and back for an unplanned outage .. Detaching and reattaching a remote copy ASP session .. Managing FlashCopy .. 366 Chapter 14. Configuring and managing CSVC/V7000 Copy Services .. SVC/V7000 Copy Services .. Setting up an IBM i SVC/V7000 Copy Services environment.

8 Configuring IBM i SVC/V7000 remote Copy Services .. Configuring IBM i SVC/V7000 FlashCopy.. Managing IBM i SVC/V7000 Copy Services .. Displaying and changing a remote copy ASP session .. Suspending a remote copy ASP session .. Detaching and reattaching a remote copy ASP session .. Planned switchover .. Unplanned failover .. Displaying and changing a FlashCopy ASP session .. Reversing a FlashCopy ASP session .. Using incremental FlashCopy .. 395 Chapter 15. Best practices.. Clustering configuration .. PowerHA license consideration .. Requirements .. Independent ASP .. Communications .. Failover wait time and default action.. Administrative domain.. Journaling .. Journal performance impact .. Journal management effort .. Best practices for planned site switches .. Regular tests .. Check cluster and replication health.

9 Reverse replication .. Ending applications using the IASP before a switchover .. Best practices for unplanned site switches .. Best practices for reducing IASP vary on times .. Keeping as few DB files in SYSBAS as possible .. Synchronizing UIDs/GIDs .. Access path rebuild.. System Managed Access Path Protection .. Switching mirroring while detached.. Resolving a cluster partition condition.. IBM i hosting environments .. Upgrading IBM i and PowerHA release .. Performing a rolling upgrade in a clustering environment.. Performing release upgrade while retaining current production system .. Integration with BRMS .. 415 Contents Normal BRMS usage .. Production IASP copy save-to-tapes on backup nodes .. Run production IASP copy saves to tapes after a roles switch.. Specific system synchronization .. User-defined IASP timestamps .. SYSBASE save-to-tape considerations.

10 Hardware replacement in a PowerHA environment .. Server replacement.. Storage system replacement .. Problem data collection .. IBM i clustering .. PowerHA GUI .. The Must Gather Data Collector .. PowerVM Virtual I/O Server .. DS8000 Copy Services .. SVC/V7000 Copy Services .. 449 Appendix A. IBM i data resilience options .. 451 IBM i full-system storage-based Copy Services solutions .. 452 Cloning IBM i.. 452 Full system FlashCopy .. 453 Full system replication by Metro Mirror or Global Mirror .. 453 Logical replication solutions .. 455 Comparison characteristics .. 457 Related publications .. 459 IBM Redbooks .. 459 Online resources .. 459 Help from IBM .. 460 Index .. 461viii PowerHA SystemMirror for IBM i Cookbook Copyright IBM Corp. 2012. All rights information was developed for products and services offered in the IBM may not offer the products, services, or features discussed in this document in other countries.