We had ran UW IMAP on aix for years. We migrated to Red Hat Linux
release 7.3
(Kernel 2.4.18-5) last week. We are running 4 Dell 1650 machines. Each
of them has
4GB memory and about 15K users.
We found the following problems after we started the services for half a
day and the
number of imapd reached over 400 on each machine
1) we ran out of memory.
2) Some times users can not login imap.
3) The system uses very little swap space.
After I restarted xinetd every half an hour. The second problem
disappeared. Did
anybody experience this before?
[kwang@lms3 kwang]$ cat /etc/redhat-release
Red Hat Linux release 7.3 (Valhalla)
[kwang@lms3 kwang]$ uname -a
Linux lms3.acs.ucalgary.ca 2.4.18-5custom #1 SMP Tue Jul 23 14:27:25 CDT
2002 i686 unknown
[kwang@lms3 kwang]$ uptime
9:53am up 2:47, 1 user, load average: 0.47, 0.30, 0.24
[kwang@lms3 kwang]$ ps -ef | grep -c imapd
482
[kwang@lms3 kwang]$ free
total used free shared buffers
cached
Mem: 3745496 3725508 19988 0 68036
3174248
-/+ buffers/cache: 483224 3262272
Swap: 1052216 0 1052216
Aug 16 15:13:03 lms1 postfix/local[10724]: 800411756E: to=<USER NAME>,
relay=local, delay=0, status=deferred (Delivery failed: Cannot allocate
memory)
Aug 16 15:13:03 lms1 vacation[12203]: vacation: fork: Cannot allocate
memory
Thanks
Kai Wang
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