Date: Fri, 01 Sep 2006 16:06:01 -0700 From: Skylar Thompson <skylar@cs.earlham.edu> To: Kris Kennaway <kris@obsecurity.org> Cc: Paul Lathrop <plathrop@squaretrade.com>, freebsd-questions@freebsd.org Subject: Re: Snapshot performance Message-ID: <44F8BCD9.4090308@cs.earlham.edu> In-Reply-To: <20060901213936.GA21561@xor.obsecurity.org> References: <44F87733.2020405@squaretrade.com> <20060901213936.GA21561@xor.obsecurity.org>
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[-- Attachment #1 --] 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 (skylar@cs.earlham.edu) -- http://www.cs.earlham.edu/~skylar/ [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (SunOS) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFE+Lzbsc4yyULgN4YRAlRfAJ9dC5MnU1tfKdpYAMKY4U708h0xhACfSfVX warXVnGguE+QaDz/RdslstM= =f7U4 -----END PGP SIGNATURE-----
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