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Old 09-03-2013, 12:18 AM   #1
sumit1203
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what percentage to be consider as io bottleneck


Hi Friends,

I am using Linux 5.5

I want to know what % if iowait should I consider as threshold for io bottleneck. My cpu and memory is ok.

Is the % also depends on number of disk.

If I want to configure monitor for iowait under nagios, what should be the warning and critical limits.


Regards,
Sumit Chauhan

Last edited by sumit1203; 09-03-2013 at 01:50 AM.
 
Old 09-04-2013, 06:15 PM   #2
unSpawn
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Depends on system HW and usage. Why not just go for the non-scientific approach? Configure something below what you would expect to be an appropriate value, watch iostat, and gradually adjust until it only trips the alert when you think it should...
 
Old 09-05-2013, 04:35 AM   #3
syg00
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Quote:
Originally Posted by sysstat_doco
%iowait
Show the percentage of time that the CPU or CPUs were idle during which the system had an outstanding disk I/O request.
This does not (necessarily) mean that there is an I/O bottleneck.
It might, or not.

Perhaps look through the iostat doco for a better metric to use as a trigger.

Whatever, I agree a "suck-it-and-see" approach is likely best.
 
  


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