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VSAM data set migrated, what can be the reason?


IBM Mainframe Forums -> JCL & VSAM
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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
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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: 8696
Location: Dubuque, Iowa, USA

PostPosted: Thu Feb 04, 2010 9:42 pm
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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: 2501
Location: Atlanta, Georgia, USA

PostPosted: Thu Feb 04, 2010 9:53 pm
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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

Moderator Emeritus


Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix

PostPosted: Thu Feb 04, 2010 9:58 pm
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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: 580
Location: London

PostPosted: Thu Feb 11, 2010 3:54 pm
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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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