Do you have more than one Dovecot server? If only one, you can still disable the mail_nfs_* settings. Also it would be interesting to see nfsstat numbers from the Dovecot server, compared to those iostat numbers..
On 18.11.2011, at 0.38, Andy Robbins wrote: > Well, the iostat command was run from the NFS server and dovecot was run from > the mail server where it is mounted, hence the discrepancy there. > > > On Thu, Nov 17, 2011 at 4:34 PM, Timo Sirainen <t...@iki.fi> wrote: > On 18.11.2011, at 0.20, Andy Robbins wrote: > > > # iostat -d 5 -x > > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz > > avgqu-sz await svctm %util > > dm-4 0.00 0.00 485.80 865.80 3886.40 6926.40 > > 8.00 28.69 19.63 0.70 94.00 > > drbd0 0.00 0.00 485.80 865.80 3886.40 6926.40 > > 8.00 111.42 94.44 0.74 99.60 > > These devices don't look like NFS, but you have: > > > mmap_disable: yes > > mail_nfs_storage: yes > > mail_nfs_index: yes > > So what filesystem is that? Are they storing only mails, or other stuff too > (like logs)? The mail_nfs_*=yes are probably not needed and are slowing > things up at least somewhat.. > > > lda: > > fsync_disable: no > > This is explicitly set for LDA, but it's the default already elsewhere. Maybe > you wanted to try fsync_disable=yes elsewhere except in LDA? > > >
