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<div class="moz-cite-prefix">On 19.01.2017 21:42, Michael Watters
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:429938d7-4c91-e3f6-ee48-a7a6273c38e5@watters.ws">
<pre wrap="">Does ovirt have any way to monitor disk I/O for each VM or disk in a
storage pool? I am receiving disk latency warnings and would like to
know which VMs are causing the most disk I/O.
</pre>
</blockquote>
We have a homebrew IO vm monitoring, libvirt uses cgroups which
record CPU and IO stats for each VM. It's a little tricky to follow
the VM while it migrates, but once done, we have cpu and IO graphs
for each VM.<br>
<br>
Basicly for each hypervisor we periodicky poll cgroup info for all
its VMs:<br>
<br>
<tt>for vm in $vms</tt><tt><br>
</tt><tt>do</tt><tt><br>
</tt><tt> (</tt><tt><br>
</tt><tt> echo -n "$HOST:$vm:"</tt><tt><br>
</tt><tt> vm=${vm/-/\\\\x2d}</tt><tt><br>
</tt><tt> egrep -v "$IGNORED_REGEX"
/sys/fs/cgroup/blkio/machine.slice/machine-qemu*$vm*/blkio.throttle.io_serviced
| grep ^253:.*Read | cut -f3 -d " " | paste -sd+ | bc</tt><tt><br>
</tt><tt> echo -n ":"</tt><tt><br>
</tt><tt> egrep -v "$IGNORED_REGEX"
/sys/fs/cgroup/blkio/machine.slice/machine-qemu*$vm*/blkio.throttle.io_serviced
| grep ^253:.*Write | cut -f3 -d " " | paste -sd+ | bc</tt><tt><br>
</tt><tt> echo -n ":"</tt><tt><br>
</tt><tt> egrep -v "$IGNORED_REGEX"
/sys/fs/cgroup/blkio/machine.slice/machine-qemu*$vm*/blkio.throttle.io_service_bytes
| grep ^253:.*Read | cut -f3 -d " " | paste -sd+ | bc</tt><tt><br>
</tt><tt> echo -n ":"</tt><tt><br>
</tt><tt> egrep -v "$IGNORED_REGEX"
/sys/fs/cgroup/blkio/machine.slice/machine-qemu*$vm*/blkio.throttle.io_service_bytes
| grep ^253:.*Write | cut -f3 -d " " | paste -sd+ | bc</tt><tt><br>
</tt><tt> echo -n ":"</tt><tt><br>
</tt><tt> cat
/sys/fs/cgroup/cpuacct/machine.slice/*$vm*/cpuacct.usage</tt><tt><br>
</tt><tt> ) | tr -d '\n'</tt><tt><br>
</tt><tt> echo ""</tt><tt><br>
</tt><tt>done</tt><br>
<br>
and then we MRTG it.<br>
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