Kris Kennaway wrote: > On Fri, Sep 01, 2006 at 11:08:51AM -0700, Paul Lathrop wrote: > >> Hi all, >> >> We're working on deploying a new mail server on FreeBSD 6.1-STABLE. One >> of the major selling points was the ability to take filesystem snapshots >> in order to make backups from a consistent filesystem on such a >> high-traffic system. Unfortunately, when I take a snapshot, performance >> slows to a crawl - to the point where the system stops responding to >> network requests (ping, SMTP, etc.). Also, the snapshot takes 10-15 >> minutes to complete. >> >> Is this a typical situation? Will I need to schedule downtime for >> backups in spite of this nifty new feature? Am I doing something wrong? >> > > Time depends on the size of the filesystem - but you are correct that > snapshots were not designed with performance in mind (rather, to speed > up booting after an unclean shutdown by removing the need to wait for > fsck). > > Kris > Are there plans to improve performance of snapshots? Using the freebsd-snapshot port to link FS snapshots to the automounter is pretty nifty, but it does kill I/O performance while that's in progress as the OP mentioned.
-- -- Skylar Thompson ([EMAIL PROTECTED]) -- http://www.cs.earlham.edu/~skylar/
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