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I noticed something strange on my machine on SUSE 12 My machine is on Azure and has three different disk(SSD) and using LVM.

As I run iostat, I noticed that one lv has very high read ,while the pv disk of this lv is on a very low speed. what could cause this problem.

FYI, sdd is a pv and dm-4 belongs to it

Thank you in advance

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
       9.74    0.00    6.15   54.87    0.00   29.23

Device            r/s     w/s     rkB/s     wkB/s   rrqm/s   wrqm/s  %rrqm  %wrqm r_await w_await aqu-sz rareq-sz wareq-sz  svctm  %util
fd0              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   0.00   0.00
sdb              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   0.00   0.00
sde              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   0.00   0.00
sdd            256.00    0.00  65296.00      0.00   919.00     0.00  78.21   0.00   47.53    0.00  13.16   255.06     0.00   3.88  99.20
sda              0.00   16.00      0.00     39.50     0.00     0.00   0.00   0.00    0.00    7.75   0.12     0.00     2.47   6.00   9.60
sdc              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   0.00   0.00
dm-0             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   0.00   0.00
dm-1             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   0.00   0.00
dm-2             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   0.00   0.00
dm-3             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   0.00   0.00
dm-4          1190.00    0.00 323472.00      0.00     0.00     0.00   0.00   0.00   44.93    0.00  57.78   271.83     0.00   0.83  99.20
dm-5             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   0.00   0.00

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