Hi Roger,
We are testing the indirect feature of xen-blkfront module these days.
And we found that, after VM live-migrate a couple of times, the "%util" of
iostat keeps being 100%, and there are several requests stock in "avgqu-sz".
We have checked some later version of Linux, and it happens on Ubuntu 14.04,
Ubuntu 14.10 and RHEL 7.0.
The iostat shows like below:
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 0.00 0.00 0.00 100.00
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz
avgqu-sz await r_await w_await svctm %util
xvda 0.00 0.00 0.00 0.00 0.00 0.00 0.00
4.00 0.00 0.00 0.00 0.00 100.00
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
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
Could you tell us that why is this happening, is this a bug?
Thanks!
Ouyang Zhaowei
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