I've got a system with 4 SATA disks hanging off an ICH6 controller,
and I'm seeing output from iostat that I dont understand:
0 seb@slurp /home/seb> iostat -dkx 1
Linux 2.6.16.24-slurp (slurp) 07/10/06
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
hda 0.01 0.04 0.18 0.02 0.74 0.26 9.69 0.05 236.03 7.61 0.16
hdb 0.03 2.67 0.89 0.57 6.87 13.01 27.08 0.03 19.34 2.39 0.35
sda 0.04 0.11 0.46 0.14 1.99 1.03 10.00 95.31 22.04 1657.68 99.96
sdb 0.04 0.11 0.30 0.13 1.37 0.95 10.79 95.31 34.64 2326.63 99.96
sdc 0.05 0.10 0.29 0.14 1.34 0.98 10.83 95.31 36.00 2334.50 99.96
sdd 0.05 0.10 0.28 0.14 1.32 0.95 10.95 95.31 33.63 2407.25 99.96
md0 0.00 0.00 1.12 0.46 4.49 1.83 8.00 0.00 0.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
hda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
hdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4251470.59 0.00 0.00 99.01
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4251470.59 0.00 0.00 99.01
sdc 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4251470.59 0.00 0.00 99.01
sdd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4251470.59 0.00 0.00 99.01
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
hda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
hdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4293981.37 0.00 0.00 100.40
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4293981.37 0.00 0.00 100.40
sdc 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4293981.37 0.00 0.00 100.40
sdd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4293981.37 0.00 0.00 100.40
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
hda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
hdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4251466.70 0.00 0.00 99.41
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4251466.70 0.00 0.00 99.41
sdc 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4251466.70 0.00 0.00 99.41
sdd 0.00 0.00 0.00 0.00 0.00 0.00 0.00 4251466.70 0.00 0.00 99.41
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md0 is a raid5 of sd[abcd]. The system is pretty much idle, so the
queue size and device utilization make no sense to me.
The system seems fine and stable, just the iostats are surprising.
Any ideas here?
--
Sebastian Kuzminsky If it isn't running programs and it isn't fusing
atoms, it's just bending space. -- Ken MacLeod
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