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I am using CentOS 5.3 As a Mail Server. But System Load Average is too much High. For that reason System is responding very slow.
top - 16:21:30 up 4:39, 1 user, load average: 77.91, 87.64, 84.56
Tasks: 641 total, 2 running, 628 sleeping, 0 stopped, 11 zombie
Cpu(s): 4.6%us, 0.9%sy, 0.0%ni, 33.6%id, 60.9%wa, 0.0%hi, 0.1%si, 0.0%st
Mem: 8309316k total, 2556448k used, 5752868k free, 13320k buffers
Swap: 8385888k total, 0k used, 8385888k free, 395804k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
18570 apache 23 0 36804 12m 2560 S 2.3 0.2 0:00.07 httpd
16005 apache 16 0 49964 25m 3088 S 2.0 0.3 0:01.02 httpd
17127 apache 15 0 46368 22m 3100 S 1.7 0.3 0:00.69 httpd
17164 apache 15 0 38640 14m 2948 S 1.7 0.2 0:00.26 httpd
18234 apache 16 0 34160 9m 2756 S 1.7 0.1 0:00.09 httpd
13033 apache 15 0 41348 17m 3040 S 1.3 0.2 0:00.48 httpd
15854 apache 15 0 34652 10m 3000 S 1.3 0.1 0:00.30 httpd
Ok, you've got 60.9%wa which would indicate that the disk is being heavily used. Either you're getting a LOT of mail in or out, or you have an application / website that is making your disk very busy. Try investigating to see if that is the case.