Hi,
We have a bad
performance issue in one of our database servers and I´ve discovered very iostat
strange numbers .
The server is
showing up normally 100.00% disk utilization but this morning I´ve shutted down
the database and the iostat was still showing 100.00 %util.
What can explain
this behaviour?
iostat -x
avg-cpu: %user %nice %system
%iowait
%idle
0.00 0.00 0.00 0.00 100.00
0.00 0.00 0.00 0.00 100.00
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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 451876.46 0.00 0.00 100.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 451876.46 0.00 0.00 100.00
md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md0 0.00 0.00 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 0.00 0.00 451876.46 0.00 0.00 100.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 451876.46 0.00 0.00 100.00
md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md0 0.00 0.00 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
%idle
0.00 0.00 0.00 0.00 100.00
0.00 0.00 0.00 0.00 100.00
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 0.00 0.00 0.00 0.00 0.00 0.00 0.00 451876.46 0.00 0.00 100.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 451876.46 0.00 0.00 100.00
md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md0 0.00 0.00 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 0.00 0.00 451876.46 0.00 0.00 100.00
sdb 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 451876.46 0.00 0.00 100.00
md1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
md0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Reimer
