I just found out something interesting that I thought that everyone else would
want to know. First, my environment: Backup server is Windows 2003 running
Networker 7.4.4 with some hotfixes. The linux client is 7.4.4 also.
We've been having a problem lately with backups either taking an extremely long
time to run, or with the backup server crashing for no apparent reason. Last
night, I was watching the backups, and I think I finally figured out why.
We use an Equallogic SAN, and I've created several LUN's that I'm mapping to
some of our Linux Redhat servers. On a couple of them, I've got a directory
structure similar to the following:
/u00
/u00/work
/u00/staging
Where /u00, /u00/work, and /u00/staging are all ISCSI LUNs. The last two LUNs
are just mounted over top of directories in /u00 (and they are obviously
mounted after /u00 is mounted). This isn't too different than doing this with
NFS mounts.
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.
Has anyone else seen this? If so, how did you work around it? Right now, the
only way I can think of to do it is to create two different clients and use
server side directives.
Thanks,
Dave
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