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
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