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Re: [Networker] Backing up ISCSI LUNS
2009-09-09 22:28:21
During backups, the client is backing up the server with a saveset
of All, which works ok in that it backs up /u00, /u00/work, and /
u00/staging as different save sets, which is what you would expect
it to do. But what it's not doing is skipping the "work" and
"staging" directories when it's backing up the /u00 save set. I
think it's because the client doesn't know that the work and
staging directories are ISCSI mounts. If these were NFS mount
points, then they would be skipped as part of the backup of /u00.
I ran some reports after the backup finished, and the backup for /
u00 was much larger than it should have been.
I'm going to open up a ticket with EMC once I do some more testing
and I can give them more information.
Opening a case with EMC on this would be a waste of time because
NetWorker is behaving as intended and as we'd expect.
iSCSI is effectively meant to be presented as local storage, in the
same way that a SAN/FC presented LUN should appear as local storage.
As such, NetWorker is doing the right thing - it wants to back it up.
To work around it - e.g., if you want to backup the LUN via the
RedHat host or in some other fashion, you need to setup directives
to skip/ignore those filesystems.
I'm going to disagree with Preston. Either, NetWorker should
backup /u00 and not see /u00/work and /u00/staging as separate
savesets, or it should see them as separate savesets and not backup /
u00/work and /u00/staging as part of /u00 as well as separately.
You should definitely open an issue with EMC -- one piece or the
other is wrong.
Ah, my apologies to Dave. Francis, you're entirely right - and this
will serve me right to read and respond to the mailing list _before_
I've had my morning coffee and put my glasses on. I misread what was
going wrong, and completely agree - if the filesystems are appearing
as 3 separate units, but NetWorker is traversing the mountpoints to
backup (and you're not using save -x), then it's definitely a problem.
Cheers,
Preston.
--
Preston de Guise
"Enterprise Systems Backup and Recovery: A Corporate Insurance Policy":
http://www.amazon.com/Enterprise-Systems-Backup-Recovery-Corporate/dp/1420076396
http://www.enterprisesystemsbackup.com
NetWorker blog: http://nsrd.wordpress.com
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