For what it's worth, this problem sounds to me like some underlying system failure and not anything in imapd. A little system with a mere 60 users should not get into this kind of trouble.
In addition to hardware issues, have you checked for other possibilities, such as a denial of service attack? -- Mark -- http://panda.com/mrc Democracy is two wolves and a sheep deciding what to eat for lunch. Liberty is a well-armed sheep contesting the vote. > Date: Wed, 22 Oct 2008 12:31:52 -0400 > From: [EMAIL PROTECTED] > To: [email protected] > Subject: [Imap-uw] uninterruptible sleep, high load average, high iowait > > Hello, > > pretty critical issue here... > > Email server specs: RHEL3, imap-2004 (yes, I know the system is old, > we're upgrading), Dell PowerEdge 2650, PERC3/di controller, 5 SCSI > drives in RAID 5 config, 60 users mostly running Thunderbird client (2.x > version). > > We have an older email server that for the past two weeks started > experiencing the following issue: > Load average (viewed by running 'top' begins to climb (usually to about > 50), iowait is pretty close to 100% and as a result all imapd processes > eventually change to stat 'D' (uninterruptible sleep). Email server then > stops responding to all current imap connections and any new connection > attempts. > > At this point even if people close their email clients many times their > sleeping imapd processes hang around and have to be killed at the > server. Once these sleeping processes are killed the system is again > fine (load, iowait are normal). > > Hardware caveat: we did have a drive fail in the array, replaced it and > everything 'seems' to work (above state notwithstanding). > > Has anyone seen this behavior? Am I missing something simple? > > fyi, we are in the process of building a new machine (PowerEdge 2950) > running Centos 5, imap-2007b, but we need to stabilize the current > production server asap. > > Many thanks in advance. > > -Jeff > > -- > Jeff Cohen > Manager, Information Systems > MÄK Technologies > 68 Moulton St. > Cambridge, MA 02138 > (617) 876-8085 x129 > > _______________________________________________ > Imap-uw mailing list > [email protected] > http://mailman2.u.washington.edu/mailman/listinfo/imap-uw _________________________________________________________________ When your life is on the go—take your life with you. http://clk.atdmt.com/MRT/go/115298558/direct/01/_______________________________________________ Imap-uw mailing list [email protected] http://mailman2.u.washington.edu/mailman/listinfo/imap-uw
