A long time ago when I was a Storage Manager, I had a user catalog that
was shared between 5 systems/system images.  If I needed to do any sort
of clean up on that catalog I had to pick a slow time (such as just
before an IPL) to do the work and then close and unallocate the catalog
from all systems except for the one that I would be doing the work on.
Of course before embarking on any sort of catalog project, I backed up
the catalog first. :-)


Norris Jackson
MVS Systems Programmer
 
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-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Hal Merritt
Sent: Thursday, October 30, 2008 11:34 AM
To: [email protected]
Subject: Re: User Catalog Hangs

Mass deletes? 

If so, that is a slow process with long RESERVE times. And that opens
windows for deadly embraces (A waiting on B who is waiting on C who is
waiting on A). 

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On
Behalf Of Magen Margalit
Sent: Thursday, October 30, 2008 6:07 AM
To: [email protected]
Subject: User Catalog Hangs

Hi.

We've attempted to delete user catalog entries. The job issued RESERVE
on the USER catalog dasd. After a while the job was cancelled while
working

and it seems that that the user catalog was hanged. 
Issuing the D GRS command showed some tasks had SHR ENQ for
Qname: SYSIGGV2  Rname: UCAT
and there were some EXCL request in WAIT status.
The other lpars indicates that the RESERVE wasn't released to.
Eventually we had to IPL the system.

Any ideas/insights would be appreciated.

Magen

 

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