IBM Mainframe Forum Index
 
Log In
 
IBM Mainframe Forum Index Mainframe: Search IBM Mainframe Forum: FAQ Register
 

How can I Prevent GDG file from migrating?


IBM Mainframe Forums -> Mainframe Interview Questions
Post new topic   Reply to topic
View previous topic :: View next topic  
Author Message
rbewoor

New User


Joined: 11 Apr 2006
Posts: 2

PostPosted: Tue Apr 11, 2006 3:24 pm
Reply with quote

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
Back to top
View user's profile Send private message
martin9

Active User


Joined: 01 Mar 2006
Posts: 290
Location: Basel, Switzerland

PostPosted: Tue Apr 11, 2006 3:36 pm
Reply with quote

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
Back to top
View user's profile Send private message
rbewoor

New User


Joined: 11 Apr 2006
Posts: 2

PostPosted: Mon Apr 17, 2006 5:44 pm
Reply with quote

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
Back to top
View user's profile Send private message
twissi

Active User


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

PostPosted: Tue Apr 18, 2006 4:05 pm
Reply with quote

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.
Back to top
View user's profile Send private message
View previous topic :: :: View next topic  
Post new topic   Reply to topic View Bookmarks
All times are GMT + 6 Hours
Forum Index -> Mainframe Interview Questions

 


Similar Topics
Topic Forum Replies
No new posts How to split large record length file... DFSORT/ICETOOL 8
No new posts Extracting Variable decimal numbers f... DFSORT/ICETOOL 17
No new posts SFTP Issue - destination file record ... All Other Mainframe Topics 2
No new posts Access to non cataloged VSAM file JCL & VSAM 18
No new posts Need help for File Aid JCL to extract... Compuware & Other Tools 23
Search our Forums:

Back to Top