 | | | I/O Utilization Statistic Strangeness in U5 | I/O Utilization Statistic Strangeness in U5 2005-06-13 - By Will Yardley
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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.
$ iostat -x
Linux 2.4.21-32.0.1.ELsmp (xxx) 06/13/05
avg-cpu: %user %nice %sys %iowait %idle
4.56 0.02 1.50 7.25 86.66
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz
avgqu-sz await svctm %util
sda 35.13 23.58 3.72 52.74 309.47 611.01 154.74 305.50 16.31
0.01 0.84 0.43 2.42
sda1 0.24 0.00 0.01 0.00 0.48 0.00 0.24 0.00 83.93
0.00 16.51 10.92 0.01
sda2 0.00 0.87 0.46 0.10 3.71 7.76 1.85 3.88 20.34
0.02 39.67 6.61 0.37
sda3 34.89 22.71 3.25 52.63 305.28 603.25 152.64 301.62 16.26
0.03 1.11 0.39 2.17
sdb 89.41 18.49 10.42 1.55 799.45 160.37 399.73 80.19 80.19
0.02 1.60 2.18 2.61
sdb1 89.41 18.49 10.42 1.55 799.45 160.37 399.73 80.19 80.19
0.02 1.60 2.18 2.61
sdc 30.12 0.36 0.72 0.02 247.08 3.04 123.54 1.52 342.03
0.01 11.43 10.44 0.76
sdc1 30.12 0.36 0.72 0.02 247.08 3.04 123.54 1.52 342.03
0.01 11.43 10.44 0.76
$ cat /etc/redhat-release
Red Hat Enterprise Linux WS release 3 (Taroon Update 5)
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