 | | | I/O Utilization Statistic Strangeness in U5 | I/O Utilization Statistic Strangeness in U5 2005-06-13 - By Tom Sightler
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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.
Also, if we reboot a system it initially reports normal, but continues
to grow as IO occurs. This would imply that iostat might be reading the
wrong information from /proc/partitions.
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.
Later,
Tom
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