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 > 508/289-3112 > Hi Eric, 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. Regards, Ken ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/ To Unsubscribe: https://lists.andrew.cmu.edu/mailman/listinfo/info-cyrus
