ADSM-L

What happens when a backup is interrupted

2003-02-26 19:10:37
Subject: What happens when a backup is interrupted
From: "Nancy R. Brizuela" <Brizuela AT UWYO DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 26 Feb 2003 17:07:08 -0700
Hi All,

Could I have someone confirm my understanding of what happens under
various circumstances when a backup is interrupted?  Do I understand
this correctly?

Per the manuals, client sessions are cancelled when the server is
halted.  If an operation, such as a backup or archive process is
interrupted when the session is cancelled, the server rolls back the
results of the current transaction.

The start window does not control whether or not a client backup
restarts after an interrupt (caused by the server).  It looks to me that
this is controlled by two parameters in the client option file, the
retry period and the maximum command retries.  It looks like a backup
would restart where it left off if the interrupt was caused by the
server.

It also appears that there is no restart provision if the interrupt is
caused by the client going down.  In that case, the backup must be
restarted.   However, if the client went down within the start window, I
think we could assume that the backup would restart, although it would
likely start completely over again.


Thanks!

Nancy Brizuela
University of Wyoming
IBM Systems Group
Ivinson Room 238
(307)766-2958

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