Why does iostat -x sometimes show incorrect values on Red Hat Enterprise Linux 4 and 5 systems ?
Issue
- When running
iostatwith the "-x" option some of the values can be unrealistically large, for example:
$ iostat -dx
Linux 2.6.9-78.EL (hostname) 01/05/09
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 2.52 2.23 3006561.74 1.54 295.82 30.19 147.91 15.10 0.00 0.06 0.00 0.00 1.89
$ iostat -dx
Linux 2.6.9-78.EL (hostname) 01/05/09
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 0.00 0.00 18889465927081071214592.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
The value for "r/s" changed from 3006561.74 to 18889465927081071214592.00.
Environment
- Red Hat Enterprise Linux 4 (RHEL4)
- Red Hat Enterprise Linux 5 (RHEL5)
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