Subject: RE: VSAM - IDCAMS Backup Puzzle
From: Edward M Martin (EMartin@aultman.com)
Date: Wed Sep 02 2009 - 10:51:45 EDT
Hello Kevin, What you say makes sense. I have been using FAVER2. We are going to be using IDCAMS BACKUP for the SNAP processing that I want to do. I will need to keep asking questions from you as I move along. Ed Martin Aultman Health Foundation 330-363-5050 ext 35050 -----Original Message----- From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU] On Behalf Of Kevin Corkery Sent: Wednesday, September 02, 2009 10:47 AM To: VSE Discussion List Subject: RE: VSAM - IDCAMS Backup Puzzle Ed ... I was under the impression that the compression dictionary entry needed to be restored along with the file since the data was still compressed on the tape and the original dictionary was required. My impression is that the backup occurs at the CI-level, this means that even if there were no records logically on the file, any formatted CI would at least be placed on the backup albeit in an abbreviated format. If you recall, backup and restoration using IDCAMS backup does not permit any reorganization of the data. You can allocate more space or change the volumes but you cannot do anything to modify the control interval of the data; index CI-sizes can be modified since the index is rebuilt. The only reorganization is that the data control intervals are placed in physical order in the file but no record level reorganization occurs. Kevin P. Corkery Independent Consultant Voorhees, NJ 08043 -----Original Message----- From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU] On Behalf Of Edward M Martin Sent: Wednesday, September 02, 2009 10:33 AM To: VSE Discussion List Subject: RE: VSAM - IDCAMS Backup Puzzle Hello Kevin, You may be right but, I thought that IDCAMS does a delete and define of the cluster with the Compress parameter. You just need to have the VSAM.COMPRESS.CONTROL file defined before you did the restore. Ed Martin Aultman Health Foundation 330-363-5050 ext 35050 -----Original Message----- From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU] On Behalf Of Kevin Corkery Sent: Wednesday, September 02, 2009 9:58 AM To: VSE Discussion List Subject: RE: VSAM - IDCAMS Backup Puzzle Ed ... I don't think that is true. The compressed image is saved. That is why the compression file information is needed to restore the data. Remember, IDCAMS backup is a CI-level process, not logical records. Kevin P. Corkery Independent Consultant Voorhees, NJ 08043 -----Original Message----- From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU] On Behalf Of Edward M Martin Sent: Wednesday, September 02, 2009 9:32 AM To: VSE Discussion List Subject: RE: VSAM - IDCAMS Backup Puzzle Hello Dave and the list, Please correct me if this is wrong, but I believe that if you have compressed files on the VSAM catalog, that they are uncompressed going to the BACKUP tape. Then the 3480 will us hardware compression to place them on the tape. Could it be that you have lots of files compressed on CAT2 and none that are compressed on CAT1? Ed Martin Aultman Health Foundation 330-363-5050 ext 35050 -----Original Message----- From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU] On Behalf Of David Stuart Sent: Tuesday, September 01, 2009 5:30 PM To: VSE Discussion List Subject: VSAM - IDCAMS Backup Puzzle Afternoon, We have something going on with IDCAMS Backup that has us puzzled. We have two VSAM Catalogs involved: Cat1 - 5 volumes, @350 files, 44% free space, files are pretty evenly spread across all 5 volumes (thank you, VSE Navigator!). Cat2 - 5 volumes, @135 files, 54% free space, files are on volumes 1 - 3. Volumes 4 and 5 are empty. Cat1 - The IDCAMS Backup takes 7 - 9 cartridges. Cat2 - The backup averages 24 cartridges. All Disk volumes reside on a DS6800, and are defined as 3390-3. Tape drives are IBM 3480-B22 with IDRC active. Ditto shows that the cartridges are 'compacted' with IDRC. The IDCAMS Backup JCL is defined the same for both catalogs: Backup (*) Blksz(65535) Buffers(8) Nocompact The Tape Datasets are defined the same way to Dynam/T with Density 08, IDRC/compacted. We've tried changing various JCL settings for Cat2, but the backups still come out the same: Cat1 - 7 - 9 cartridges, Cat2 - @24 cartridges. Ideas? TIA, Dave Dave Stuart Prin. Info. Systems Support Analyst County of Ventura, CA 805-662-6731 David.Stuart@ventura.org
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