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<p>Hello Openstack-Discuss,</p>
<p>after some digging I found out that cinder learned to resize
attached (in-use) volumes quite a while ago with the introduction
<br>
of the initial "extend 'in-use' volume" feature: <br>
<a class="moz-txt-link-freetext" href="https://review.opendev.org/c/openstack/cinder/+/454287/">https://review.opendev.org/c/openstack/cinder/+/454287/</a></p>
<p>The support was then extended to also cover Ceph RBD backed
volumes with:<br>
<a class="moz-txt-link-freetext" href="https://review.opendev.org/c/openstack/nova/+/613039/">https://review.opendev.org/c/openstack/nova/+/613039/</a><br>
</p>
<p>Since this is only about the cinder part, I was wondering if nova
would ever find out and would actively rescan the device / volume
and quintessentially present an increased new size to the guest.
Apparently this is where a certain <span id="output">volume-extended
event</span> comes into play:
<a class="moz-txt-link-freetext" href="https://review.opendev.org/c/openstack/nova/+/454322/">https://review.opendev.org/c/openstack/nova/+/454322/</a> that is to
be emitted by cinder when a volume had been extened.<br>
</p>
<p>I then went head and tried this with the openstack cli (as
Horizon does not seem to support / offer to resize in-use volumes.<br>
I run Openstack Train with Ceph RBD as storage. First I ran into
an issue with the openstack cli (<a class="external-link"
href="https://bugs.launchpad.net/cinder/+bug/1871759/comments/2"
target="_blank" rel="nofollow noopener">https://bugs.launchpad.net/cinder/+bug/1871759/comments/2</a>)
but using <br>
</p>
<p> cinder extend $volumeid $newsize</p>
<p>I was able to resize in-use volumes just fine.</p>
<p>The only thing missing was the propagation to the guest. I played
around with SCSI rescans, but that did not work, reboots also
failed to do anyting in this regards. Stopping and starting the VM
did work, but why having the capability to online-resize an
attached volume when not being able to resize the guest volume as
well?<br>
</p>
<p>Apparently there seems to be an old and somewhat similar
observation / bug with
<a class="moz-txt-link-freetext" href="https://bugs.launchpad.net/nova/+bug/1369465">https://bugs.launchpad.net/nova/+bug/1369465</a></p>
<p><br>
</p>
<p><br>
</p>
<p>So I was simply wondering if this is expected to be working?<br>
Are there any special settings / options I need to set to enable
this feature?</p>
<p><br>
</p>
<p><br>
</p>
<p>Thanks and with kind regards</p>
<p><br>
</p>
<p>Christian<br>
</p>
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