Strang iostat numbers

[Carlos H. Reimer]

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

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

avg-cpu:  %user   %nice %system %iowait   %idle
           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
Reimer

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