Because Oracle RMAN data is encapsulated in Legato savestreams neither
can optimize for the backup as well if they were truly integrated (not
that integration is ever going to happen). Also, one of Legato's
strengths is the parallization of backups which improves backup
performance, but slows recovery.

There is a lot of metadata that has to be updated during Oracle
restores. Rather than backup to disk, have you looked at Virtual Tape
Libraries yet? With data de-duplication and the know issues with
adv_file systems, I would think a VTL would work better.

With a VTL library you can do all your backups to the VTL and clone
tapes from your current library for offsite backups. 

-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Patricia Neal
Sent: Thursday, March 15, 2007 10:50 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] lengthly restores

Why does it take so long to restore Oracle DB's and products? When I
back up to tape, it takes 6 hours for 500GB's. We had a problem with our
Storage Area and I needed to restore the whole 500 GB's last night. It
took 17 hours. Why?? 
I'm going to have to look into backing up to disk rather than tape. I've
got everybody on my back about this. Restoring from disk would probably
be quicker in a situation like this. The amount of disk space I would
need for something like this is like 2 1/2 times the amount that I'm
backing up though isn't it?
 
Patricia Neal
Production Support Specialist
C.S.E.A.

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