Avleen Vig wrote:
Is anyone else experiencing this?
I'm finding that during times when a snapshot is being created for a
partition, all access of that partition hangs until the snapshot is
completed.
On a large partition (180Gb, 66% used), this takes over 10 minutes for
me.
I've found that any time the partition (which is NFS mounted) is being
accessed when the snapshot creation starts, the creation seems to take
an even longer amount of time and sometimes isn't complete after 30 mins
when I reboot the box.
The problem is also really bad when the background fsck is starting and
makes a snapshot first, which takes a lot of production time out a
server which just crashed that I'm trying to restore.
This is probably a known issue. I say probably because it sounds like
the regular fs suspended state that the filesystem goes into when doing
the snapshot. You didn't mention which FreeBSD version you were using,
but many fixes have been made to recent 6-STABLE branches regarding
filesystems, but none that will alleviate your problems.
Have you tried burying your snapshot file down deeper in the directory
tree, and changing the mode on the parent(s) to something only root
could love? For instance:
/.snap/2006/snapshotfile
Where /.snap and /.snap/2006 are chmod 0700.
I think that you might only see the locking/hanging if a process
attempts to stat the snapshot file while it's being created.
Eric
--
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Eric Anderson Sr. Systems Administrator Centaur Technology
Anything that works is better than anything that doesn't.
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