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[francis <382607308@xxxxxx>]

Public bug reported:

1、Cannot set IO scheduler   
root@VM-132-36-ubuntu:~# echo "deadline" > /sys/block/vda/queue/scheduler               
root@VM-132-36-ubuntu:~# cat /sys/block/vda/queue/scheduler                             
none
2、iostat display high iowait 
avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           0.09    0.00    0.13    0.15    0.00   99.62

Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
vda               0.07     0.61    0.77    0.61    15.21    14.03    42.26     0.01 22228.49 23156.92 21049.84   1.47   0.20
vdb               0.00     0.00    0.02    0.00     0.07     0.00     8.38     0.00  109.49  109.49    0.00   1.99   0.00

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1385123

Title:
  ubuntu 3.13.0-32-generic kernel IO problem

Status in “linux” package in Ubuntu:
  New

Bug description:
  1、Cannot set IO scheduler   
  root@VM-132-36-ubuntu:~# echo "deadline" > /sys/block/vda/queue/scheduler               
  root@VM-132-36-ubuntu:~# cat /sys/block/vda/queue/scheduler                             
  none
  2、iostat display high iowait 
  avg-cpu:  %user   %nice %system %iowait  %steal   %idle
             0.09    0.00    0.13    0.15    0.00   99.62

  Device:         rrqm/s   wrqm/s     r/s     w/s    rkB/s    wkB/s avgrq-sz avgqu-sz   await r_await w_await  svctm  %util
  vda               0.07     0.61    0.77    0.61    15.21    14.03    42.26     0.01 22228.49 23156.92 21049.84   1.47   0.20
  vdb               0.00     0.00    0.02    0.00     0.07     0.00     8.38     0.00  109.49  109.49    0.00   1.99   0.00

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