I have seen wrong percent use of a disk IO some times on servers that have been a long time without reboot.
By any means this server has significant IO. Tonight it'll be rebooted and I'm sure tomorow we will have nice %use. Uptime is 497 days.
root@xxxxxx:~# iostat -x 1
Linux 2.6.24-27-server (xxxxxx) 10/13/2011
avg-cpu: %user %nice %system %iowait %steal %idle
0.55 0.00 0.30 7.54 0.00 91.60
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm **%util**
sda 17649.65 765.65 5478.46 5262.33 36185.00 48224.35 7.86 19.06 1.78 4.58 **4920.45**
The only thing is that nagios sees this as critical.
Any explanation will be wellcomed.
Thank you in advance.
Added later:
As you can see, the statistics are 0, and the % is going down quite slowly.
Linux 2.6.24-27-server (xxxxxxx) 10/13/2011
avg-cpu: %user %nice %system %iowait %steal %idle
0.55 0.00 0.30 7.54 0.00 91.61
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 13578.30
590.03 4214.71 4048.69 27838.04 37110.10 7.86 14.67 1.78 4.58 3785.44
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.00 0.00 0.00 100.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.00 0.00 0.00 100.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.00 0.00 0.00 100.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.00 0.00 0.00 100.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00
0.00 0.00 10.00 0.00 80.00 8.00 0.00 0.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.00 0.00 0.00 100.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.00 0.00 0.00 100.00
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00
0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00