On Fri, 2007-04-13 at 01:15 -0400, nilesh vaghela wrote: > We have mail server running with sendmail, horde with front end and around > 350 users. > > Some time the server indicate very high cpu usage. > > What is to be ckeck > > We are using RHEL3. > > > 10:49:11 up 91 days, 18:55, 3 users, load average: 11.93, 15.27, 13.87 > 259 processes: 254 sleeping, 4 running, 1 zombie, 0 stopped > CPU states: cpu user nice system irq softirq iowait idle > total 66.8% 0.0% 13.2% 0.4% 0.0% 118.8% 0.0% > cpu00 39.9% 0.0% 7.5% 0.5% 0.1% 51.6% 0.0% > cpu01 27.0% 0.0% 5.7% 0.0% 0.0% 67.1% 0.0% > Mem: 1024780k av, 1008968k used, 15812k free, 0k shrd, 13764k > buff > 749248k actv, 143504k in_d, 14280k in_c > Swap: 1999992k av, 437476k used, 1562516k free 558700k > cached > -------------- > [root@mailserver root]# ps -el | grep imap | wc -l > 109 > ----------------- The "iowait" field in the CPU usage status means your processess are waiting for some data. Check you disk and network latency. 1 GB RAM should do it, but your swap is bieng hit quite hard. Check vmstat for si and so (swap in / swap out) - I think that's where youp problem is. Try stopping unnecessary services or simply add an extra GB of RAM to that machine. Regards, Andrei -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
