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Jim Oates
Beginner
Joined: 06 Mar 2012
Posts: 9
Topics: 3
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 Posted: Wed Mar 07, 2012 8:02 pm Post subject: ADRDSSU to reduce wasted space in FB PDS datasets |
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Pre-ramble.
The task is to replace a weekly batch job from using DMS to ADRDSSU. The current job reduces wasted space in specfic (HLQ selectable) PDS datasets in a z/OS environment.
The current job selects
** PDS datasets
** that are Fixed Block
then
** Releases space so the dataset is at least 80% used
** Secondary space is reset
** Datasets already at least 80% used are not processed
The actual DMS statements are:
| Quote: | SELECT DSNAME=(xxxNP.DMIC.PBS1.STGD./,
xxxNP.DMIC.SLC1.STGD./,
xxxNP.DMIC.SPT1.STGD./),
CRITERIA=(DSORG,EQ,PO,AND,RECFM,EQ,FB)
RELEASE PCTUSED=80,CONVERT,PCTSECONDARY=25 |
Questions:
Does a RECFM filter exist? I don't see it in the "DFSMSdss Storage Administration Guide."
Is COMPRESS, and perhaps RELEASE, really the proper commands? My concern are the comments that COMPRESS actually compresses (eg zip, tar, etc.) the data along with moving empty space to the end of the dataset. It even warns about using COMPRESS on datasets containing executable code.
Any other suggestions?
PS. I do apologize for what are likely to be ADRDSSU 101 questions but I am being pulled in, after a decade of not working on the mainframe. Thanks to MVSFORUMS my initial questions have been resolved. |
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expat
Intermediate
Joined: 01 Mar 2007
Posts: 475
Topics: 9
Location: Welsh Wales
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| Posted: Thu Mar 08, 2012 2:29 am Post subject: |
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RELEASE is to release unused space, and you are correct in thinking that COMPRESS is to use compression on the output dump/backup dataset.
I don't recall a RECFM filter being available with DFdss.
I don't think that Dfdss will have all of the functionality you need.
Might be worth having a word with your storage people, as it seems a bit wierd to me having PS datasets with free space in them anyway.
_________________
If it's true that we are here to help others,
then what exactly are the others here for ? |
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Jim Oates
Beginner
Joined: 06 Mar 2012
Posts: 9
Topics: 3
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| Posted: Tue Mar 13, 2012 11:06 am Post subject: |
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Expat. I waited for additional information before responding. It was your response that prompted me to open a dialog with the vendor.
You are correct. According to IBM Support "DFSMS :ADRDSSU" does not contain that functionality. They would accept a "design change request" and "get this facility with DFSMS in next release of z/OS." I declined to make that request.
The suggestion was to use NAVIQUEST and REXX. |
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Jim Oates
Beginner
Joined: 06 Mar 2012
Posts: 9
Topics: 3
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| Posted: Tue Mar 13, 2012 11:07 am Post subject: |
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Hmmm, I forgot to thank you for responding....
Thanks! |
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