0

we use iostat -x and check for the await column - per device it shows the total time spent waiting plus the actual handling of the request by the disk

iostat -yzx 5


Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
sdm               0.00     0.00    0.00    1.60     0.00     4.20     5.25     0.00    0.75    0.00    0.75   0.62   0.10
sda               0.00     0.40    0.00    3.00     0.00    24.70    16.47     0.11   37.60    0.00   37.60   7.13   2.14
sdc               0.00     0.00    0.00    0.80     0.00     6.10    15.25     0.01   12.75    0.00   12.75  12.75   1.02
sdb               0.00     0.00    0.00    0.40     0.00     2.40    12.00     0.01   19.50    0.00   19.50  19.50   0.78
sdd               0.00     0.00    0.00    0.80     0.00     6.60    16.50     0.01   10.75    0.00   10.75  10.75   0.86
sdg               0.00     0.00    0.00    1.00     0.00     8.90    17.80     0.02   15.80    0.00   15.80  15.80   1.58
sdf               0.00     0.20    0.00    1.00     0.00     8.00    16.00     0.01   12.80    0.00   82.80  12.80   1.28
sde               0.00     0.00    0.00    0.80     0.00     7.50    18.75     0.01   11.25    0.00   11.25  11.25   0.90
sdk               0.00     0.00    0.00    0.80     0.00     6.50    16.25     0.01   14.25    0.00   14.25  14.25   1.14
sdi               0.00     0.00    0.00    1.00     0.00     7.20    14.40     0.01   11.60    0.00   11.60  11.60   1.16
sdj               0.00     0.00    0.00    0.80     0.00     5.90    14.75     0.01   13.50    0.00   13.50  13.50   1.08
sdh               0.00     0.00    0.00    0.80     0.00     5.60    14.00     0.01   13.25    0.00   13.25  13.25   1.06
sdl               0.00     0.00    0.00    1.00     0.00     7.20    14.40     0.01   14.20    0.00   14.20  14.20   1.42
sdn               0.00     0.00    0.00    1.60     0.00     4.20     5.25     0.00    0.88    0.00    0.88   0.75   0.12
md1               0.00     0.00    0.00    0.40     0.00     3.20    16.00     
sdq               0.00     0.00    0.00    0.60     0.00     5.20    17.33     0.01   12.67    0.00   82.67  12.67   0.76
sdr               0.00     0.00    0.00    0.60     0.00     4.20    14.00     0.01   10.00    0.00   10.00  10.00   0.60

we can see from the output that await on some disk is high

my question - what we can do about this ?

any option to resolve this ?

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