Dave,
The speed of the restore does sound like it's going a bit slowly, but it
could be affected by several factors. One thing that will affect it is the
way Legato interleaves data on the tapes during backups. For example, if
you have several backups (from several servers) running at the same time,
Networker "interleaves" data chunks from each backup as it's writing to
tape. While this is great for speedy backups, it can slow down restore
procedures. If you backed up the server by specifying the "all" save set as
for the backup job, then the data from each "drive" is interleaved on the
tape.
I think (but not sure since I've never had to do a full disaster recovery),
that when you do a restore, the user program will serialize the restores.
This means that it will restore the D: drive, then the E: drive, then F:,
for example. What this means for the restore, is that it will de-interlace
all the data for the D: drive, then the E: drive, and so on. Depending on
how you do your backups, this could take a while (ie, you did a full backup
several weeks ago, and incrementals every night since then).
Hope this helps.
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On
Behalf Of Werth, Dave
Sent: Thursday, June 16, 2005 5:06 PM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Restore questions
Folks,
We had a total failure of a RAID array on our main server. After it took
the IBM tech's 2 days to get the hardware fixed we've started a restore and
it's going a lot slower than we'd like (it'll take 2 or 3 days to restore at
the present rate). I wondered it anyone out there would have any
suggestions for speeding up the process. At this point though I'm reluctant
to stop the restore we've got going unless I'm pretty sure I can improve the
speed enough to make a difference.
Our systems are as follows:
Backup Server: Windows 2K, Legato 6.1.3 (I know I need to upgrade, it'll
happen in the next 3 months), Spectralogic 10K tape library with 2 AIT-2
tape drives, 100M network connection.
Server being restored: Windows 2K, Legato 6.1.3, RAID array with 3 logical
drives (E:, F:, G:), 100M networking. The system disk was ok.
We have about 250GB to restore and it appears to be going at about 2GB/hour
at this point.
To restore the drives we just opened Networker User on the restore system,
clicked on the 3 drives and told it to start.
I could give more information but it's probably better to answer any
specific questions you may have.
We will be upgrading to AIT-4 tapes and Networker 7.x before too long but
that doesn't do us any good now :-(
Any suggestions you may have would be appreciated. It's probably too late
for this restore but could be useful for future reference.
Thanks, Dave
David Werth
Garmin AT, Inc
Salem, Oregon
dave.werth AT garmin DOT com
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