On Tue, Nov 23, 2010 at 10:38:31AM -0800, Chris St Denis wrote: > Is this just due to the very high io bandwidth usage associated with > making a snapshot, or does the creation of this snapshot completely > block IO writes for around 5 minutes?
It blocks updates to the filesystem while during part of the snapshot process. See the comments in /usr/src/sys/ufs/ffs/ffs_snapshot.c I found using UFS snapshots on a production fileserver untenable during normal working hours. I have a backup fileserver that I rsync the files to, and then use the UFS snapshots there. > Any suggested workarounds? I already bumped up the number of Apache > slots to 166% but it looks like I would have to increase the number much > more to use that as a primary solution. Use ZFS. The way snapshots work there, they are nearly instantanous to create, and you are not limited to 20 snapshots per filesystem. -Kurt _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
