IBM Exploring PPRC for Reliable Data Protection and Access

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All necessary repair actions due to a hardware failure are performed concurrently with customer operation.

With the RVA, data availability is also maintained during upgrades. Upgrading disk arrays or cache size can be done concurrently with subsystem operation, without impact or performance degradation.

2.4.2 SnapShot

With SnapShot you can make a copy of your online data to use for different tests while the original data is available to the production system. In the same way, you can use a SnapShot copy to back up volumes to tape or other media while online applications continue to have access to the original data.

2.4.3 PPRC

PPRC provides a synchronous copying capability for protection against loss of access to data in the event of an outage at the primary site. Whenever a disaster occurs at the primary site and the data there is no longer available, you can switch to the secondary site. The switch is nearly without impact to or outage of your operating system, and all data is again available with minimal effort.

Chapter 2. RVA Benefits for VSE/ESA 11

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Contents International Technical Support Organization Page International Technical Support Organization First Edition January Contents Peer-to-Peer Remote Copy Itso Redbook Evaluation Contents Vi Ramac Virtual Array, Peer-to Peer Remote VSE/ESA Team That Wrote This Redbook PrefaceYour comments are important to us Comments WelcomeIBM Ramac Virtual Array What Is an IBM Ramac Virtual Array?Overview of RVA and the Virtual Disk Architecture Log Structured File− Functional track table Data Compression and CompactionWhat Is IXFP/SnapShot for VSE/ESA? What Is SnapShot?VSE/ESA Support for the RVA Deleted Data Space Release What Is IXFP?Reporting Functions What Is Peer-to-Peer Remote Copy?Ramac Virtual Array, Peer-to Peer Remote VSE/ESA RVA Benefits for VSE/ESA RVA Simplifies Your Storage ManagementDisk Capacity Administration Ixfp Batch Window Improvement IXFP/SnapShot for VSE/ESA Ramac Virtual ArrayApplication Development RVA Data AvailabilityHardware Pprc SnapShotRamac Virtual Array, Peer-to Peer Remote VSE/ESA Prerequisites VSE/ESA Support for the RVAVolumes 1 VSE/ESA Input/Output Configuration ProgramHost Connection Partial Disk Minimal Init Volume Minimal InitAssgn ExecRamac Virtual Array, Peer-to Peer Remote VSE/ESA System VSE/ESA User Time IXFP/SnapShot for VSE/ESASample Batch Job to Invoke Ixfp Report Function DTRIATTN,PARM=′ Ixfp REPORT′IXFP/SnapShot for VSE/ESA Phys DetailAR 0015 CUU DEF DefinedIxfp Snap Full VolumeVSE/VSAM Reply ′ YES′ to ProceedRange of Cylinders Non-VSAM File Expired Files Total Volume Ixfp DDSR,PATEV3Ixfp DDSR,PATEV30000-0999,NOPROMPT Ixfp DDSR,PATEV3DSN=′ test.data.3′ , Noprompt Specified FileIxfp REPORT,80E Ixfp REPORT,80F Ixfp REPORT,80E,80FIxfp Report Device Detail Report Sample Output of Ixfp Report CommandRamac Virtual Array, Peer-to Peer Remote VSE/ESA Subsystem Summary Report Device Summary ReportRamac Virtual Array, Peer-to Peer Remote VSE/ESA Peer-to-Peer Remote Copy Peer-to-Peer Remote CopyPprc Data Flow Pprc and VSE/ESA Software RequirementsInvoking peer-to-peer remote copy Pprc Hardware RequirementsSnapShot Considerations Examples of Pprcopy CommandsPrimary Devices of a Pprc Pair Secondary Devices of a Pprc PairRecovering from a Primary Site Failure Setting Up Pprc Paths and PairsRecovering from a Secondary Site Failure Deleting Pprc Pairs and PathsPhysical Connections to the RVA Determining the Channel Connection Address Determining the Logical Control Unit Number for RVARamac Virtual Array, Peer-to Peer Remote VSE/ESA Functional Device Configuration Appendix A. RVA Functional Device ConfigurationFunctional Device Configuration Screen CD23 Appendix B. Ixfp Command Examples Snap CommandSyntax Ramac Virtual Array, Peer-to Peer Remote VSE/ESA Noprompt Using SnapShot to Copy One Volume to AnotherAR 0015 Capacity DEFINED-CAPACITYTest Prod Overall Test Prod Using SnapShot to Copy Files with Relocation Using SnapShot to Copy a File from One Volume to AnotherIXFP20I Snap Function Completed AT Other Uses of SnapShotSyntax of Ixfp Ddsr Command Details Ddsr CommandUsing Ddsr to Delete the Contents of a Volume Using Ddsr to Delete a Single Data SetUsing Ddsr to Delete the Free Space on an RVA ReportAR+0015 IXFP29D Ddsr for For Deletion Report Command Reporting on the Capacity of Multiple Volumes Reporting on the Capacity of a Single VolumeReporting on the Capacity of the RVA Subsystem Device Detail Report FUNC. Capacity MBIXFP/SnapShot Setup Job Streams JOB WCWTEST1Exec DTRIATTN,PARM=′ Ixfp REPORT′ BG 0000 1A86I Following Assignments are Released BG 0000 // JOB InitdiskIxfp DDSR,80E Ready Ixfp DDSR,80F$$DITTO BLKFACTOR=1 EOJ 50.83 47.86 AR 0015 1I40I Ready$$DITTO BLKFACTOR=1 $$DITTO EOJ 726532.208 MB 117880.209 MB 57754.953 MB Appendix C. VSE/VSAM Considerations Backing up Vsam Volumes Appendix C. VSE/VSAM Considerations Ramac Virtual Array, Peer-to Peer Remote VSE/ESA Appendix D. Iocds Example Ramac Virtual Array, Peer-to Peer Remote VSE/ESA Appendix E. Special Notices Following terms are trademarks of other companies International Technical Support Organization Publications Appendix F. Related PublicationsRedbooks on CD-ROMs Other PublicationsRamac Virtual Array, Peer-to Peer Remote VSE/ESA ∙ E-mail Orders How to Get Itso RedbooksPlease send me the following IBM Redbook Fax Order FormSee CKD IndexPprc distance Please answer the following questions Itso Redbook EvaluationSG24-5360-00