ADSM-L

Re: Big Restores?

2002-04-25 18:50:41
Subject: Re: Big Restores?
From: Andrew Raibeck <storman AT US.IBM DOT COM>
Date: Thu, 25 Apr 2002 18:50:26 -0400
Some additional considerations:

If DIRMC is being used, you shouldn't need to restore the directories
first.

Concurrent restores of high-level directories might offer some performance
benefits, but there is no guarantee that one of the restore operations
won't end up waiting on a tape in use by another restore operation. If
restoring multiple volumes, though, you could launch concurrent restores
for each volume and get some performance benerit, provided that you have a
pure collocation by file space environment.

TSM 5.1 offers multi-session restore capability (requires 5.1 server and
client) if (a) you are doing a "no query" restore, and (b) the data is on
sequential media (like tape).

Regards,

Andy

Andy Raibeck
IBM Software Group
Tivoli Storage Manager Client Development
Internal Notes e-mail: Andrew Raibeck/Tucson/IBM@IBMUS
Internet e-mail: storman AT us.eyebm DOT com (change eye to i to reply)

The only dumb question is the one that goes unasked.
The command line is your friend.
"Good enough" is the enemy of excellence.




"Don France (TSMnews)" <DFrance-TSM AT ATT DOT NET>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
04/25/2002 15:30
Please respond to "ADSM: Dist Stor Manager"


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        Subject:        Re: Big Restores?



1.  Turn OFF client and admin schedules;
2. Turn OFF any real-time virus scan (on the destination client);
3. If you're doing restore to Windows platform, use  -DIRSONLY option, to
restore just the directories, first -- after first pass, then restore
the -FILESONLY -- using PIT restore options, in both cases;
4. Use command-line client, AND consider using CLASSIC restore (eg,
specify -PICK option) so the server will sort & consolidate tape mounts;
5. Run multiple restore sessions from separate high-level directories, up
to
the number of tape drives available for the task.

Monitor network pipe on both ends, ensure it's full of data (remove any
bottlenecks observed, such as other apps like lfcep.exe).  Expect to get
5-10 GB per hour with large file server;  best case, maybe up to 15 GB/Hr.

Don France
Technical Architect - Tivoli Certified Consultant

Professional Association of Contract Employees (P.A.C.E.)
San Jose, CA
(408) 257-3037
don_france AT att DOT net


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