From: Robert Banz (no email)
Date: Thu Oct 05 2006 - 13:29:43 EDT
On Oct 5, 2006, at 12:40, Elizabeth Schwartz wrote:
> Is anyone happily running all of the above? All of the above except
> NIS? Any tuning hints?
>
> I'm running Solaris 10 (06/06), cyrus 2.3.7 (Blastwave build) ,
> sendmail 8.13.8 (ditto), mailspool on a zfs filesystem, authenticating
> via NIS. I've already solved one problem with VERY slow sendmail
> response, turned out to be a Solaris NIS bug ( patch 123186-01)
Run procsystime (from the dtrace toolkit) on the cyrus imap
processes. I'm going to bet that they do a lot of fdsync's.
There's a bug in ZFS regarding performance problems when fsync'ing
file descriptors -- there's apparently going to be a patch coming
"real soon now" -- your options are:
1) Move your mail spool off of ZFS.
2) Remove all of the fsync() calls from cyrus. (this may mean
removing them from berkely db ;) )
-rob
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