Date: Fri, 17 Aug 2007 13:17:08 -0700 From: Chuck Swiger <cswiger@mac.com> To: Mark Messier <mark@messier.com> Cc: FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: performance hints (6.2) Message-ID: <0CB0F62F-8071-4CAE-BFE7-6ECCBE701678@mac.com> In-Reply-To: <4B90A9A7-D8D6-49C5-B097-00094486EF4A@messier.com> References: <4B90A9A7-D8D6-49C5-B097-00094486EF4A@messier.com>
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On Aug 17, 2007, at 1:00 PM, Mark Messier wrote: > I've got a freebsd 6.2 system, dual 2Ghz 5130 cpu, 4g ram, with raid5 > Adaptec 2120s, running not much more than /usr/ports/mail/imap-uw > and I'm having performance problems with only 20 IMAP users. > > I'm not swapping.. cpu is mostly idle, so I figure it must be I/O > performance. Just to confirm, is that what the following show? You're seeing upwards of 400 I/O transactions per sec, so your system is definitely I/O bound. Note that RAID-5 is not an ideal choice for a filesystem which is going to be used for balanced read-write operations-- it's best used for read-only or read-mostly purposes. You are probably using the default mbox mail format; you're likely to find that using maildir would work much better when running on a RAID-5 volume. Regards, -- -Chuck
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