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
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