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recently, one of my centOS 4.4 server got slow, and I found it has high load average, low cpu usage, I din't find any specific process eating cpu or memory, anyway to find what's going on with this server?
[root@localhost ~]# sar
Linux 2.6.9-5.0.3.ELsmp (localhost.localdomain) 01/23/2008
12:00:02 AM CPU %user %nice %system %iowait %idle
12:10:02 AM all 3.50 0.01 1.94 1.54 93.01
12:20:02 AM all 3.57 0.00 1.94 1.44 93.05
12:30:01 AM all 3.22 0.00 1.94 1.43 93.41
12:40:01 AM all 3.21 0.00 1.93 1.41 93.45
12:50:01 AM all 3.57 0.00 1.93 1.41 93.09
01:00:01 AM all 3.48 0.01 1.89 1.40 93.22
01:10:01 AM all 3.46 0.00 1.94 1.32 93.27
01:20:01 AM all 3.58 0.00 1.92 1.41 93.08
01:30:01 AM all 3.52 0.01 1.97 1.41 93.10
01:40:01 AM all 3.59 0.01 1.94 1.50 92.96
01:50:01 AM all 3.47 0.00 2.00 1.36 93.17
02:00:01 AM all 3.33 0.00 1.92 1.37 93.38
02:10:01 AM all 3.24 0.01 1.95 1.42 93.38
As syg00 pointed out, over half your swap is being used.. that's not good. If it's always at that sort of level, adding more RAM is indicated. Functionally, swap is just a temp extension of RAM, it should normally (for decent perf) be mostly unused.
From your posts there, swap usage is slowly increaseing ....
You've got several disks there that are nearly full; you need to purge unwanted stuff and/or backup & remove some stuff before they fill up.
Alternately, add more disks.