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<p>Anyone please ?<br>
</p>
<div class="moz-cite-prefix">Le 08/12/2022 à 23:13, Jérôme BECOT a
écrit :<br>
</div>
<blockquote type="cite"
cite="mid:f32132a0-becd-9120-f6cf-34a95fc22124@deveryware.com">
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<p>Hello Openstack,</p>
<p>We have Ussuri deployed on a few clouds, and they're all
plugged to PureStorage Arrays. We allow users to only use
volumes for their servers. It means that each server disk is a
LUN attached over ISCSI (with multipath) on the compute node
hosting the server. Everything works quite fine, but we have a
weird issue when extending volumes attached to running
instances. The guests notice the new disk size .. of the last
extent.</p>
<p>Say I have a server with a 10gb disk. I add 5gb. On the guest,
still 10gb. I add another 5gb, and on the guest I get 15, and so
on. I've turned the debug mode on and I could see no error in
the log. Looking closer at the log I could catch the culprit:</p>
<p>2022-12-08 17:35:13.998 46195 DEBUG
os_brick.initiator.linuxscsi [] Starting size: <b>76235669504</b><br>
2022-12-08 17:35:14.028 46195 DEBUG os_brick.initiator.linuxscsi
[] volume size after scsi device rescan <b>80530636800</b>
extend_volume<br>
2022-12-08 17:35:14.035 46195 DEBUG os_brick.initiator.linuxscsi
[] Volume device info = {'device':
'/dev/disk/by-path/ip-1...1:3260-iscsi-iqn.2010-06.com.purestorage:flasharray.x-lun-10',
'host': '5', 'channel': '0', 'id': '0', 'lun': '10'}
extend_volume<br>
2022-12-08 17:35:14.348 46195 INFO os_brick.initiator.linuxscsi
[] Find Multipath device file for volume WWN 3624...<br>
2022-12-08 17:35:14.349 46195 DEBUG os_brick.initiator.linuxscsi
[] Checking to see if /dev/disk/by-id/dm-uuid-mpath-3624..
exists yet. wait_for_path<br>
2022-12-08 17:35:14.349 46195 DEBUG os_brick.initiator.linuxscsi
[] /dev/disk/by-id/dm-uuid-mpath-3624... has shown up.
wait_for_path<br>
2022-12-08 17:35:14.382 46195 INFO os_brick.initiator.linuxscsi
[] mpath(/dev/disk/by-id/dm-uuid-mpath-3624) <b>current size
76235669504</b><br>
2022-12-08 17:35:14.412 46195 INFO os_brick.initiator.linuxscsi
[] mpath(/dev/disk/by-id/dm-uuid-mpath-3624) <b>new size
76235669504</b><br>
2022-12-08 17:35:14.413 46195 DEBUG oslo_concurrency.lockutils
[] Lock "extend_volume" released by
"os_brick.initiator.connectors.iscsi.ISCSIConnector.extend_volume"
:: held 2.062s inner 2022-12-08 17:35:14.459 46195 DEBUG
os_brick.initiator.connectors.iscsi [] <== extend_volume:
return (2217ms) <b>76235669504</b> trace_logging_wrapper<br>
2022-12-08 17:35:14.461 46195 DEBUG
nova.virt.libvirt.volume.iscsi [] Extend iSCSI Volume
/dev/dm-28; new_size=<b>76235669504</b> extend_volume <br>
2022-12-08 17:35:14.462 46195 DEBUG nova.virt.libvirt.driver []
Resizing target device /dev/dm-28 to <b>76235669504</b>
_resize_attached_volume <br>
<br>
</p>
<p>The logs clearly shows that the rescan confirm the new size but
when interrogating multipath, it does not. But requesting
multipath few seconds after on the command line shows the new
size as well. It explains the behaviour.<br>
</p>
<p>I'm running Ubuntu 18.04 with multipath 0.7.4-2ubuntu3.2. The
os-brick code for multipath is far more basic than the one in
master branch. Maybe the multipath version installed is too
recent for os-brick.</p>
<p>Thanks for the help</p>
<p>Jerome<br>
</p>
<p><br>
</p>
</blockquote>
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<div class="moz-signature"><b><span style="color:#002060">Jérôme
BECOT</span></b> <span style="color:#002060"></span><br>
<span style="color:#002060">Ingénieur DevOps Infrastructure </span><br>
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