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VSAM data set migrated, what can be the reason?

 
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DB2 Guy

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Joined: 28 Oct 2008
Posts: 98
Location: Cubicle

PostPosted: Thu Feb 04, 2010 9:33 pm    Post subject: VSAM data set migrated, what can be the reason?
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Hi,

A VSAM data set is migrated at my shop, I was under the impression that VSAM data sets never go off-line, does that mean volume on which the DSN was, is migrated?

Will posting the LISTCAT help getting bettr replies?
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Robert Sample

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Joined: 06 Jun 2008
Posts: 7999
Location: Bellevue, IA

PostPosted: Thu Feb 04, 2010 9:42 pm    Post subject:
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The HSM manual talks about the VSAM Data Set Migration Parameter so it is possible for VSAM data sets to be migrated and recalled.
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Bill O'Boyle

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Joined: 14 Jan 2008
Posts: 2502
Location: Atlanta, Georgia, USA

PostPosted: Thu Feb 04, 2010 9:53 pm    Post subject: Reply to: VSAM data set migrated, what can be the reason?
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If you run a LISTCAT and the dataset's been migrated to Cartridge, you may wait a while. If it has gone to Cartridge (MIGRAT2), submit it as a Batch Job and not from ISPF 3.4 or 6.

Is your site using DFHSM (Hierarchal Storage Management)?

Bill
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Thu Feb 04, 2010 9:58 pm    Post subject:
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Hello,

Quote:
I was under the impression that VSAM data sets never go off-line
An incorrect impression. . . Lots of vsam files get migrated when not in use. . .

Quote:
does that mean volume on which the DSN was, is migrated?
Probably not because entire dasd volumes are not typically migrated - files are migrated, but not dasd volumes.
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Pete Wilson

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Joined: 31 Dec 2009
Posts: 440
Location: London

PostPosted: Thu Feb 11, 2010 3:54 pm    Post subject:
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Suggest you talk to your Storage Administrator. Assuming your dataset is SMS managed (i.e. it has a Storclas), then it is the Mgmtclas assigned to the dataset that determines it's Migration criteria. If you think it shouldn't be migrated and can justify it the Storage Admin people would be able to alter the configuration to prevent its migration. The Mgmtclas the dataset has been assigned can be seen in a LISTCAT. You can view the Mgmtclases available in your site can be viewed from ISMF option 3 panel (if you have access to them) which provides online help to understand what the values of each field mean.

It is also possible to do an IDCAMS ALTER to change the datasets Mgmtclas to a more suitable one, but that also requires appropriate security access.
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