I would suggest starting by reviewing your memory usage (esp. swap) with top and disk usage with "iostat -x 3" (part of the sysstat package) More than likely you are running into problems in one of these areas. -Blake Andre Nathan wrote: > Hello > > We have a cyrus server that runs under heavy load, and a few days ago it > started to show a behaviour where its lmtpd processes take a long time > to deliver messages sent from postfix. Below is an example of a postfix > log message. with the email address removed: > > Feb 28 17:14:11 mta13 postfix/lmtp[9633]: 63CBA700071C: > to=<user=domain.com@xxxxxxxxxxxxxxxxxxxxx>, > relay=box2.prv.f3.k8.com.br[10.8.5.49]:2003, conn_use=6, delay=1718, > delays=0.15/1118/0/600, dsn=4.4.2, status=deferred (conversation with > box2.prv.f3.k8.com.br[10.8.5.49] timed out while sending end of data -- > message may be sent more than once) > > The last field in the "delays" field shows that the time out occurred > after 600s trying to send the message to cyrus. Even when a timeout does > not occur, the time for the message to be sent is around 100-300s. > > We have some other more lightly loaded servers in which the data is sent > to lmtpd very quickly, and at any given moment there are only a few > lmtpd's running. On the heavily loaded servers, there are always a few > thousand lmtpd processes. > > I've run strace on lmtpd processes on both servers, and I couldn't spot > any significative difference in their behaviours. They both run > cyrus-imapd 2.2.12. > > So, I'm looking for some help and suggestions in trying to debug this > situation, and maybe some tuning options to for lmtpd, or at least find > out why they're taking so long to do complete the message delivery. The > load on this server has always been pretty high, but this behaviour only > started recently. It has much more mailboxes than the other server, as > it mounts its volumes from a large AoE storage device. > > Thanks in advance, > Andre > > ---- > Cyrus Home Page: http://cyrusimap.web.cmu.edu/ > Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki > List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html > ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
