Issue

• Iostat shows that 'svctm' is increasing proportionally to 'await'.

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await  svctm  %util
mpathe            0.00 51803.00    1.00  430.00     4.00 220108.00  1021.40   143.78  338.08   2.32 100.00
mpathe            0.00 56896.00    0.00  424.00     0.00 217088.00  1024.00   144.87  340.30   2.36 100.00
mpathe            0.00 48895.00    0.00  416.00     0.00 212992.00  1024.00   142.41  350.05   2.40 100.00
mpathe            0.00 56896.00    0.00  424.00     0.00 217088.00  1024.00   138.99  323.44   2.36 100.10
mpathe            0.00 53617.00    0.00  430.00     0.00 216692.00  1007.87   143.46  331.03   2.33 100.00
mpathe            0.00 54864.00    1.00  426.00     4.00 218796.00  1024.82   141.27  332.48   2.34 100.00
mpathe            0.00 52044.00    1.00  422.00     4.00 215380.00  1018.36   142.10  333.22   2.36 100.00
mpathe            0.00 50572.00    0.00  400.00     0.00 204800.00  1024.00   145.59  359.29   2.50 100.00
mpathe            0.00 51295.00    0.00  408.00     0.00 208896.00  1024.00   143.96  358.56   2.45 100.00
mpathe            0.00 55385.00    2.00  424.00     8.00 217088.00  1019.23   138.83  327.49   2.35 100.10

Another io pattern that was seen was :

00:40:01     dev8-224      0.01      0.04      0.00      8.00      0.00     12.67     12.67      0.01
00:40:01     dev8-227      0.01      0.04      0.00      8.00      0.00     12.67     12.67      0.01

00:40:01     dev67-48      0.01      0.05      0.00      8.00      0.00     10.75     10.75      0.01
00:40:01     dev67-51      0.01      0.05      0.00      8.00      0.00     10.75     10.75      0.01