IBM SG24-5360-00 manual Ramac Virtual Array, IXFP/SnapShot for VSE/ESA

Page 19

2.2.1 RAMAC Virtual Array

The RVA′s virtual disk architecture enables performance improvement in batch processing. This new architecture, coupled with data compression and

self-tuning capabilities, improves disk capacity utilization. Data from all logical volumes is written across all the physical disks the array. Automatic load balancing across the volumes occurs as data is written to the array. Further, the ability of the RVA to dynamically configure additional volumes of various sizes eliminates volume contention and thereby reduces I/O bottlenecks.

In the RVA, space that has never been allocated or is allocated but unused takes up no capacity. Data set size can increase and new files can be created with minimal need to reorganize existing stored data. Users of traditional storage systems keep lots of available free space to avoid batch application failures, wasting valuable space and increasing storage costs. With the RVA it is not necessary to keep lots of free space to avoid out-of-space conditions.

2.2.2 IXFP/SnapShot for VSE/ESA

Based on the belief that the best I/O is no I/O, IXFP/SnapShot for VSE/ESA reduces online system outage by reducing the amount of elapsed time backups and copies need to complete. IXFP/SnapShot for VSE/ESA improves these aspects of batch processing:

∙Data backup

Data is backed up during batch processing for many different reasons. Copying data to protect against a hardware, software, or application failure in the computer center is considered an operational backup. The backup might be a complete copy of all data, or an incremental copy, that is, a backup of the changes made since the last backup.

Data backups can be taken between processing steps to protect against data loss if a subsequent job or step fails. These backups are called interim backups. In some data centers, interim backups are done with tapes.

Using SnapShot to replace the backup and/or copy operations speeds up processing. Tapes are no longer required, and interim backups are done more quickly. Additional interim backup points are now possible because of the instantaneous copy capability and reduced batch processing time. The interim backups are deleted after successful completion of the batch process.

In many cases the operational backups made are also used for disaster recovery. Many of the considerations for disaster recovery are also valid for operational backup. You can minimize the time for disaster backups using SnapShot, by making a SnapShot copy to disk. You can then restart online applications before making a tape backup of the SnapShot copy.

∙Data set reorganization

Data set reorganization is very often a time-consuming part of nightly batch processing. The REORG becomes important especially when it is part of the critical path of batch processing. Traditional reorganization procedures copy the affected VSAM key-sequenced data set (KSDS) into a sequential data set on tape or on another DASD. This activity takes a long time when large data sets are copied. SnapShot can dramatically reduce the run time when used in place of IDCAMS REPRO to copy the KSDS into a sequential data set on another DASD.

Chapter 2. RVA Benefits for VSE/ESA 9

Page 18 Page 20
Image 19
Page 18 Page 20
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 WelcomeLog Structured File What Is an IBM Ramac Virtual Array?IBM Ramac Virtual Array Overview of RVA and the Virtual Disk Architecture− Functional track table Data Compression and CompactionWhat Is SnapShot? What Is IXFP/SnapShot for VSE/ESA?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 Simplifies Your Storage Management RVA Benefits for VSE/ESADisk Capacity Ixfp AdministrationBatch Window Improvement IXFP/SnapShot for VSE/ESA Ramac Virtual ArrayRVA Data Availability Application DevelopmentHardware Pprc SnapShotRamac Virtual Array, Peer-to Peer Remote VSE/ESA Prerequisites VSE/ESA Support for the RVA1 VSE/ESA Input/Output Configuration Program VolumesHost Connection Exec Volume Minimal InitPartial Disk Minimal Init AssgnRamac 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 Defined DetailPhys AR 0015 CUU DEFIxfp Snap Full VolumeVSE/VSAM Reply ′ YES′ to ProceedRange of Cylinders Non-VSAM File Expired Files Ixfp DDSR,PATEV3 Total VolumeIxfp DDSR,PATEV30000-0999,NOPROMPT Ixfp DDSR,PATEV3DSN=′ test.data.3′ , Noprompt Specified FileIxfp REPORT,80E,80F Ixfp REPORT,80E Ixfp REPORT,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 RequirementsSecondary Devices of a Pprc Pair Examples of Pprcopy CommandsSnapShot Considerations Primary Devices of a Pprc PairRecovering from a Primary Site Failure Setting Up Pprc Paths and PairsDeleting Pprc Pairs and Paths Recovering from a Secondary Site FailurePhysical 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 Snap Command Appendix B. Ixfp Command ExamplesSyntax Ramac Virtual Array, Peer-to Peer Remote VSE/ESA Noprompt Using SnapShot to Copy One Volume to AnotherDEFINED-CAPACITY AR 0015 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 SetReport Using Ddsr to Delete the Free Space on an RVAAR+0015 IXFP29D Ddsr for For Deletion Report Command Device Detail Report FUNC. Capacity MB Reporting on the Capacity of a Single VolumeReporting on the Capacity of Multiple Volumes Reporting on the Capacity of the RVA SubsystemJOB WCWTEST1 IXFP/SnapShot Setup Job StreamsExec DTRIATTN,PARM=′ Ixfp REPORT′ Ready Ixfp DDSR,80F BG 0000 // JOB InitdiskBG 0000 1A86I Following Assignments are Released Ixfp DDSR,80E$$DITTO BLKFACTOR=1 EOJ 50.83 47.86 AR 0015 1I40I Ready$$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 Other Publications Appendix F. Related PublicationsInternational Technical Support Organization Publications Redbooks on CD-ROMsRamac 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
Top Page Image Contents