Installation policy for enqueuing on volumes

mathi.vanan · New User Joined: 11 Jan 2012 Posts: 18 Location: INDIA

I am trying to run two jobs simultaneously, for unloads from Imagecopy (IC) files.

IC files reside on tape volumes.

When the jobs run in parallel and try to access the same volume, one of the job is cancelled with the below message in the log.

Bill Woodger · Posted: Mon Mar 12, 2012 4:52 pm

Why do you want to run them at the same time if they are going to wait for each other?

Operations have cancelled the second job. They don't want a "wait" clogging up their display.

Why don't you put both steps in the same job?

mathi.vanan · New User Joined: 11 Jan 2012 Posts: 18 Location: INDIA

Thanks for the suggestion, Bill.

I have a situation of unloading around 800 tables. I have created appropriate number of JCLs that would unload different tables in individual steps.

I had quoted an example of 'two' jobs.

My intention of raising this question is, i need not want the job to be cancelled.

Now, is there a way out?

Robert Sample · Posted: Mon Mar 12, 2012 5:09 pm

enrico-sorichetti · Posted: Mon Mar 12, 2012 5:31 pm

but wiser to review Your concept of media sharing
and modify accordingly your your plan for job scheduling

if the wait message is relative to a tape VOLUME You will have to single thread Your jobs FULL STOP

the TS should be glad that the VOLUME enq was setup for the WTOR policy
less forgiving organization and I DEFINITELY AGREE use a straight CANCEL policy

why clutter the system with jobs waiting around ?

daveporcelan · Posted: Mon Mar 12, 2012 7:18 pm

expat · Posted: Tue Mar 13, 2012 1:43 pm

Maybe looking at the FLASHCOPY with Dfdss backups of the shadow volumes might be a solution, but you need to talk to your storage people to see if this capability exists for the DASD installed.

Another option could be synchronised backups using IBM's REPLICATOR (formerly TDMF), but that depends on if your site has purchased the software or not.

mathi.vanan · New User Joined: 11 Jan 2012 Posts: 18 Location: INDIA

Sorry for the late response..

Thanks Dave and expat..

I have requested my site's support group for the list of IC files and the corresponding volumes for grouping them..

I am happy that i got an answer

gcicchet · Posted: Thu Mar 15, 2012 5:43 am

Hi,

I would not recommend it, but change the DISP=SHR to DISP=OLD but you will still tie up an initiator.

Gerry

mathi.vanan · New User Joined: 11 Jan 2012 Posts: 18 Location: INDIA

@gcicchet:

Have you tried it? Your suggestion wont work.

The job would still be cancelled in reason accessing the same volume.

I had tried changing DISP=SHR to DISP=OLD.

gcicchet · Posted: Fri Mar 16, 2012 3:31 am

Hi,

Yes,I always test what I suggest and here is proof of it.

mathi.vanan · New User Joined: 11 Jan 2012 Posts: 18 Location: INDIA

Yes Gerry.

I guess my site's default is set to WTOR and so the job is cancelled by the operator, which might be different in your site.

expat · Posted: Fri Mar 16, 2012 12:00 pm

Just a quick clear up question, but is the volume that has the problem the input volume or output volume ?

mathi.vanan · New User Joined: 11 Jan 2012 Posts: 18 Location: INDIA

expat,

Its the input file's volume. The tape file that has been used for unloading was unavailable.

expat · Posted: Fri Mar 16, 2012 12:05 pm

You can only use one specific tape volume for any one job at any time, so the answer is a big NO, that you can use the same tape at the same time for two or more different jobs.