[SunHELP] masive IO wait with kernel using most of the CPU

[Ravi Katti]

You might as well look into /var/adm/messages for scsi/disk related errors. 
I s this system some kind of nfs/nis server? If yes have a look at nfsstat.

Thx


----Original Message Follows----
From: Michelle Loranger <r8aagm at email.sps.mot.com>
Reply-To: sunhelp at sunhelp.org
To: sunhelp at sunhelp.org
Subject: [SunHELP] masive IO wait with kernel using most of the CPU
Date: Mon, 04 Mar 2002 15:30:04 -0600

If anyone has any ideas as to how I can track down this mysterious IO
wait problem, It would help me a ton.  It seems that I have many
machines on my network experienceing this ridiculous IO wait but not for
any processes that I can pin down.  It doesn't appear to be platform
specific as I am seeing it on servers as well as workstations.  The only
common ground I can pin down (but am not allowed to test) is the all
these machine has SUn Grid Engine and Orcallator running.  Below is the
results of top:

last pid:  1517;  load averages:  1.53,  1.24,  1.48
15:28:25
50 processes:  49 sleeping, 1 on cpu
CPU states:  0.0% idle,  0.4% user, 25.0% kernel, 74.6% iowait,  0.0%
swap
Memory: 2048M real, 31M free, 56M swap in use, 1992M swap free

   PID USERNAME THR PRI NICE  SIZE   RES STATE   TIME    CPU COMMAND
  5718 root       1  -5    0 5880K 1464K sleep  30:09 12.49% bptm
  1514 root       1 -25    0 1600K 1464K cpu/1   0:15  6.25% top
  5717 root       1  34    0 6104K 1872K sleep  95:30  2.00% bpbkar
20838 root       8  33    0 4976K 1992K sleep   8:56  1.84% mountd
   487 root       1  33    0 3592K 1304K sleep  71:39  0.52% rpcbind
17494 root      25  25    0 4080K 2264K sleep   1:53  0.02% nscd
  6488 root       1  33    0   24M 4472K sleep  24:33  0.00% se.sparc.5.6
   539 root       6  34    0 3224K 1656K sleep  14:02  0.00% automountd
  6652 root       1  33    0 3280K  968K sleep  12:08  0.00% cdsd
   720 root       1  13    0 2264K  968K sleep   6:24  0.00% arraymon
  1046 root       1  33    0 1952K 1112K sleep   5:57  0.00% mibiisa
  5715 root       1  33    0 2920K 1704K sleep   4:27  0.00% bpbrm
     1 root       1  33    0  704K   88K sleep   3:24  0.00% init
20840 root       1  33    0 1824K 1136K sleep   2:50  0.00% nfsd
   517 root       1  33    0 1880K 1120K sleep   1:36  0.00% inetd

Let me know what anyone thinks, in the meantime, I'll keep searchin.

THX
michelle
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