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How can I Prevent GDG file from migrating?

 
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rbewoor

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Joined: 11 Apr 2006
Posts: 2

PostPosted: Tue Apr 11, 2006 3:24 pm    Post subject: How can I Prevent GDG file from migrating?
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Hi,
This is the first time I am mailing here so here goes.... icon_biggrin.gif

I have a weekly job that has to backup several large GDG versions on Friday. Every hour a new version of the GDG file is to be created and this job initiates and causes a contention with the backup job. This is because large number of GDG versions get migrated over the week.

Is there any way to prevent the migration of these GDG files either by:

1) Coding some parameter in the JCL while creating a new creating a new version and this will override any storage class setting that are in place.
or
2) Will I have to find out and use a suitable storage class parameter in the JCL (which would be shop dependant). In this case what are the exact parameters I should look out for and what are the usual values (if any).

Thanks for your help.
Rohit
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martin9

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Joined: 01 Mar 2006
Posts: 288
Location: Basel, Switzerland

PostPosted: Tue Apr 11, 2006 3:36 pm    Post subject:
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hy rbewoor,

if this is a real problem at your site,
contact your storage manager, if
he can define any special file names
or some special storage management class,
which prevents this gdg versions from being
migrated so fast...

if there is no definition in sms, will be difficult...

martin9
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rbewoor

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Joined: 11 Apr 2006
Posts: 2

PostPosted: Mon Apr 17, 2006 5:44 pm    Post subject:
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Hi Martin,

I am inclined to agree with what you say, will take it up with the DFSMS team.

Meanwhile, I have been looking around and found coding MGMTCLAS=MCNOMIG might be able to do the trick while creating the newer versions of the GDG.
What are your thought on this? Is it a sure shot way or again depends....

Rohit
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twissi

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Joined: 01 Aug 2005
Posts: 105
Location: Somerset, NJ

PostPosted: Tue Apr 18, 2006 4:05 pm    Post subject:
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Hi Rohit,

In addition to that, there is something called RETENTION PERIOD. This actually determines the period that particular dataset should remain on mainframe.

It used to be a couple of characters normally like ?N, ?T etc.

Get the retention period of your installation and rename the dataset with a new one that includes the retention period.

Cheers, Twissi.
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