ADSM-L

Re: Using Backupsets for Disaster Recovery

2002-05-01 05:49:35
Subject: Re: Using Backupsets for Disaster Recovery
From: John Naylor <john.naylor AT SCOTTISH-SOUTHERN.CO DOT UK>
Date: Wed, 1 May 2002 10:48:57 +0100
Michael,
At last, something I  do not entirely agree with from Paul.
I would not use backupsets for everything, but they are excellent for speading
up the restore of large data servers.
Provided you take them regularly and I think twice weekly is overkill, then the
fromdate overhead to bring in subsequent backups is not too great.
I think weekly or every two weeks would be adequate, but I suppose the answer
for you is to test to see what meets your recovery requiremnts.
I do not think that your server should be hanging.
Are you running     "MPThreading       Yes"  ?
If you are satisfied that TSM is getting enogh processor,check with your OS390
performance
person,  then the other thing to check is how long since TSM was recycled,
It is common for OS390 systems not to need an IPL for months at a time and for
TSM only to be recycled when these IPLs come along.
In my experience TSM does get slower if not regularly recycled, and I would
suggest that
this should be done on a monthly basis.
Hope this helps,
John





"Seay, Paul" <seay_pd AT naptheon DOT com> on 05/01/2002 09:20:13 AM

Please respond to "ADSM: Dist Stor Manager" <adsm-l AT vm.marist DOT edu>

To:   adsm-l AT vm.marist DOT edu
cc:    (bcc: John Naylor/HAV/SSE)
Subject:  Re: Using Backupsets for Disaster Recovery



We do not because it is too cumbersome.

The answer is what were Backupsets really created for?  When Tivoli Sales
comes in they sell backupsets as a way to send a remote user/site (laptop
users are the main ones) a place to start a recovery from so that the
transmission of the entire system over a slow link is eliminated.  The
backupset is restored first then a restore to bring in all the updates.
Dramatic savings for those slow line connected users (56K).

It can be used for servers, but that was not the backupsets' original
mission in life.

Paul D. Seay, Jr.
Technical Specialist
Naptheon, INC
757-688-8180