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.
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