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Old 09-03-2012, 02:11 AM   #1
L1nuxn00b703
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iostat question


Hello,
I have a server is running at 100% util:

Code:
# iostat -x 1
Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0        0.00    77.00  1.00 409.00     8.00  3664.00     8.96   144.25  313.20   2.44 100.20

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.75    0.00    0.00   49.12    0.00   50.13

Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0        0.00    61.00  7.00 402.00    56.00  3656.00     9.08   144.77  370.45   2.45 100.10

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           1.00    0.00    0.25   48.75    0.00   50.00

Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0        0.00   125.00  4.00 350.00    32.00  3744.00    10.67   144.23  389.89   2.83 100.10

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           8.25    0.00    0.50   47.00    0.00   44.25

Device:         rrqm/s   wrqm/s   r/s   w/s   rsec/s   wsec/s avgrq-sz avgqu-sz   await  svctm  %util
cciss/c0d0        0.00   276.00 20.00 363.00   160.00  4608.00    12.45   104.93  431.57   2.61 100.10

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.00    0.00    0.25   24.75    0.00   75.00
Now I know there is disk utilization issue but how do I pinpoint the cause? What command can I use to find the high disk utilization culprit?

Thanks.
 
Old 09-03-2012, 05:53 AM   #2
chrism01
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I'd start with iotop
http://linux.die.net/man/1/iotop - man page
http://www.linux-mag.com/id/8366 - example usage/output etc
 
Old 09-03-2012, 05:59 AM   #3
L1nuxn00b703
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hello chris,
Thx for the reply. This is a critical server and nothing can be installed. Any other suggestions?
 
Old 09-03-2012, 07:46 AM   #4
chrism01
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Did you check to if iotop is there?

You can use top, by looking for processes in states D or S http://slack-linux.blogspot.com.au/2...ate-codes.html & http://linux.die.net/man/1/top

Try also lsof http://linux.die.net/man/8/lsof & fuser http://linux.die.net/man/1/fuser.

You also need to point out to your management the problem with restricting you from from being able to install the correct tools, especially if they want a fast, correct diagnosis & fix (& I'm sure they do).
 
  


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