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Re: [BackupPC-users] BackupPC on XFS getting lots of error -4 when calling...
2011-05-24 10:41:29
"Doherty, Peter Charles" <Peter_Doherty AT hms.harvard DOT 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
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