"Doherty, Peter Charles" <peter_dohe...@hms.harvard.edu> wrote on
05/24/2011 10:21:39 AM:
> >Just a note - our large xfs backuppc partition with many years of
> >historic backups and tens of millions of hardlinks does not even allow
> >for xfs_check - the program consumes all available memory (8GB) and
> >after a few days swaps itself to death.
>
> My memory is a little uncertain, and I can't find a solid reference, but
I
> think you can use "xfs_repair -n" in place of xfs_check, without making
> any changes to the FS, and xfs_repair is less memory intensive.
> I'd be pretty worried operating a file system that had grown beyond the
> limits of what the FS check utility can handle.
I had that happen on EXT3. My backup systems tend to run with a
relatively small amount of memory (512MB). I had a 2TB EXT2 partition
mark itself dirty, and I could not get it to come back up without running
fsck on it. However, the OOM killer would kill it before it could
complete.
I ended up upgrading that system to 2GB of RAM merely so that I could
finish the fsck.
(Oh, and to a long-ago debate about would more RAM help BackupPC to do its
job: nope. The backups with 2GB took almost exactly the same amount of
time as the ones with 512MB. I wasn't swapping with 512MB, and there just
isn't that much data that can be profitably cached while doing a backup,
as long as the file list can fit in RAM: the few dentries and inodes in
use at a time just don't take that much space...)
Timothy J. Massey
Out of the Box Solutions, Inc.
Creative IT Solutions Made Simple!
http://www.OutOfTheBoxSolutions.com
tmas...@obscorp.com
22108 Harper Ave.
St. Clair Shores, MI 48080
Office: (800)750-4OBS (4627)
Cell: (586)945-8796
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