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I've never tried with 2 disks but I will assume that the next free
available disk will be used by the vdsm hook and the vm-dump-metrics
cmd will check the kind of disk.<br>
Let me know if you give a try....<br>
<br>
thanks,<br>
Arsène<br>
<br>
<div class="moz-cite-prefix">On 04/19/2016 02:43 PM, Simon Barrett
wrote:<br>
</div>
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<p class="MsoNormal"><span style="color:#1F497D">Thanks again
but how does that work when a VM is configured to have more
than one disk?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If I have a VM
with a /dev/vda disk and a /dev/vdb disk, when I turn the
vhostmd hook on the vm metric device gets created as
/dev/vdb and the original /dev/vdb disk gets bumped to
/dev/vdc.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Is that
expected behavior? Will that not cause problems?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><a moz-do-not-send="true"
name="_MailEndCompose"><span style="color:#1F497D"><o:p> </o:p></span></a></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span
style="color:windowtext"> Arsène Gschwind
[<a class="moz-txt-link-freetext" href="mailto:arsene.gschwind@unibas.ch">mailto:arsene.gschwind@unibas.ch</a>]
<br>
<b>Sent:</b> Tuesday, 19 April, 2016 13:06<br>
<b>To:</b> Simon Barrett
<a class="moz-txt-link-rfc2396E" href="mailto:Simon.Barrett@tradingscreen.com"><Simon.Barrett@tradingscreen.com></a>; <a class="moz-txt-link-abbreviated" href="mailto:users@ovirt.org">users@ovirt.org</a><br>
<b>Subject:</b> Re: [ovirt-users] vhostmd vdsm-hook<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">The metric
information are available on this additional disk /dev/vdb.
You may install the package vm-dump-metrics and use the
command vm-dump-metrics which will display all metrics in an
xml format.<br>
<br>
Arsène<span style="font-size:12.0pt"><o:p></o:p></span></p>
<div>
<p class="MsoNormal">On 04/19/2016 10:48 AM, Simon Barrett
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal"><span style="color:#1F497D">Thanks
Arsène,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I have
vhostmd running on the ovirt node and have set the
sap_agent to true on the VM configuration. I also stopped
and started the VM to ensure that the config change took
effect.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">On the oVirt
node I see the vhostmd running and see the following entry
in the qemu-kvm output:</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">drive
file=/dev/shm/vhostmd0,if=none,id=drive-virtio-disk701,readonly=on,format=raw
-device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x8,drive=drive-virtio-disk701,id=virtio-disk701</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">The part I
wasn’t quite understanding was how this presented itself
on the VM but I now see a new disk device “/dev/vdb”. If I
cat the contents of /dev/vdb I now see the information
that is provided from the ovirt node, which is great news
and very useful.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks for
your help.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Simon</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span
style="color:windowtext">
<a moz-do-not-send="true"
href="mailto:users-bounces@ovirt.org">users-bounces@ovirt.org</a>
[<a moz-do-not-send="true"
href="mailto:users-bounces@ovirt.org">mailto:users-bounces@ovirt.org</a>]
<b>On Behalf Of </b>Arsène Gschwind<br>
<b>Sent:</b> Monday, 18 April, 2016 16:03<br>
<b>To:</b> <a moz-do-not-send="true"
href="mailto:users@ovirt.org">users@ovirt.org</a><br>
<b>Subject:</b> Re: [ovirt-users] vhostmd vdsm-hook</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Hi Simon,<br>
<br>
You will need to have vhostmd running on the oVirt node and
set the "sap_agent" custom property for the vm as you may
see on the screenshot.<br>
<br>
<img id="_x0000_i1025"
src="cid:part5.02060400.03080709@unibas.ch"
alt="sap_agent" height="125" width="664" border="0"><br>
<br>
Arsène<o:p></o:p></p>
<div>
<p class="MsoNormal">On 04/15/2016 12:15 PM, Simon Barrett
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">I’m trying to use the vhostmd vdsm host
to access ovirt node metrics from within a VM. Vhostmd is
running and updating the /dev/shm/vhostmd0 on the ovirt
node.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">The part I’m stuck on is: “This disk
image is exported read-only to guests. Guests can read the
disk image to see metrics” from
<a moz-do-not-send="true"
href="http://www.ovirt.org/develop/developer-guide/vdsm/hook/vhostmd/">http://www.ovirt.org/develop/developer-guide/vdsm/hook/vhostmd/</a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Does the hook do this by default? I
don’t see any new read-only device mounted in the guest.
Is there additional work I need to do to mount this and
access the data from within the guest?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Many thanks,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman ,serif",serif"><br>
<br>
<br>
<br>
</span><o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Users mailing list<o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="mailto:Users@ovirt.org">Users@ovirt.org</a><o:p></o:p></pre>
<pre><a moz-do-not-send="true" href="http://lists.ovirt.org/mailman/listinfo/users">http://lists.ovirt.org/mailman/listinfo/users</a><o:p></o:p></pre>
</blockquote>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New Roman
,serif",serif"> </span><o:p></o:p></p>
</blockquote>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman",serif"><o:p> </o:p></span></p>
</div>
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