 | | | I/O Utilization Statistic Strangeness in U5 | I/O Utilization Statistic Strangeness in U5 2005-06-13 - By Ed Greshko
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Will Yardley wrote:
> On Tue, Jun 14, 2005 at 06:19:04AM +0800, Ed Greshko wrote:
>
>>Tom Sightler wrote:
>
>
>>>Over the weekend we upgraded several of our RHEL3 systems to U5 and
>>>since then we have noticed that our network monitoring started alerting
>>>us to high IO utilization values on multiple servers. Upon looking into
>>>this problem we've found that running 'iostat -x 1' does show 100%
>>>utilization even though nothing is really going on on the disk. It
>>>would appear that this might be a bug in iostat, or that something
>>>changes in /proc/partitions that iostat was using because older versions
>>>of iostat report even stranger numbers.
>
>
>>>Anyone else seeing this or is it some uniqueness on our systems?
>>>
>>>Running a quick 'iostat -x 1' and see if any of your drives show 100%
>>>utilization would be an easy way to show it.
>
>
>
>>Seeing the same thing. It should be noted however that only the drive
>>itself shows 100%. e.g. /dev/hdc Individual partitions seem to
>>reporting just fine.
>
>
> Looking Ok on a few machines over here.
Yes, because scsi devices don't exhibit the "issue" that is outlined in
the iostat man page that was trimmed from my previous message. :-)
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