ktm at rice.edu
Fri Aug 5 11:34:21 EDT 2016
On Fri, Aug 05, 2016 at 11:11:33AM -0400, Eric W. Bates via Info-cyrus wrote:
> We are migrating our cyrus from a venerable computer to a new one.
> We've been gradually moving individuals over to the new machine and are
> quite surprised at the poor performance characteristics we're seeing on
> the new machine.
> The new machine:
> 2 @ 6 core Xeon E5-2640
> 256 Gb memory
> zfs built on 18 SAS drives with SSDs for zfs cache and log
> Freebsd 10.2-RELEASE-p7
> Cyrus imapd 2.5.7
> There are approximately 1000 copies of imapd running at any given moment.
> The load average hovers around 5.
> Can anyone suggest what we might look at to assess why imapd seems to be
> such heavy lifting?
> Clark 159a, MS 46
How many users do you have? It is typical to have one or more imapd
processes per user. Look at the I/O stats for your filesystems to
see if you have a bottleneck somewhere. Also, what type of SSDs are
you using for your ZFS log devices? We found we needed RAM-style
SSDs to maximize our I/O performance under ZFS.
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