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Re: [Veritas-bu] Restore from Data Domain using 3 selections
2008-06-09 21:01:24
I don’t know if the Open Storage option now available in
6.5 will change the way that NBU handles restores from devices like the Data
Domain. From what we can gather, the OST option is more helpful for folks
backing up to a Data Domain and also needing to make offsite copies to tape for
vaulting purposes. As we don’t use any tape now we haven’t
pursued the OST any further. I have no idea if it has any benefits when
it comes to restores.
Mark Glazerman
Desk: 314-889-8282
Cell: 618-520-3401
P please don't print this e-mail unless you really need to
From: Tim Hoke
[mailto:thoke AT northpeak DOT org]
Sent: Monday, June 09, 2008 3:36 PM
To: Mark Glazerman
Cc: Jeff Lightner; veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Restore from Data Domain using 3 selections
That's certainly one way to do
it, but Jeff's original problem is related to the difference in how bptm and
bpdm perform restore operations (actually it happens when the restore is kicked
off while the images are examined in the catalog).
If a restore is initiated for tape, the restore jobs are "mpx"
restore jobs and if everything falls into place, all the streams begin
restoring at the same time (from one or many tapes). However, when disk
is found, the "mpx" restore is turned off and therefore everything is
restored sequentially... even if it WAS multiple streams that your underlying
disk technology can support (ie, don't have multiple reads/writes from/to the
same physical disk).
I'd suggest an enhancement request to your favorite avenue (support, SE, etc).
-Tim
On Mon, Jun 9, 2008 at 3:27 PM, Mark Glazerman <Mark.Glazerman AT spartech DOT com>
wrote:
Jeff,
The way that Data Domain
restores is down to how you submit the restore jobs from the backup and restore
console in NBU. If you want to restore root, usr and var you could click
on root, uncheck the mountpoints you don't want to restore and kick off the
restore. That will restore everything in 1 job. If you drill down
and only select the individual mountpoints you want and kick each one off as an
individual restore, Data Domain will send data to multiple restore jobs.
As an FYI we found that we were
able to restore our biggest database (Exchange) quicker in a single stream than
in multiple streams. A single stream allowed us to restore approximately
100GB per hour.
Mark Glazerman
Desk: 314-889-8282
Cell: 618-520-3401
P please don't print this e-mail unless you
really need to
For the second time I've noticed that a
backup we created that had 3 simultaneous selections going to Data Domain (as
it previously did to tape) on restore is only doing a single
selection. When we did this to tape it would restore 3 different
selections simultaneously just as it had backed them up.
Is there something I need to tell bprestore
to force it to do this when the 3 selections were all going to the same
location like a Data Domain? If not would starting 3 separate
restores of only the files in the specific selections cause it to run
concurrently?
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