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docs: Add an upgrade doc note about Glance show_multiple_locations #1012

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Mar 27, 2024
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docs: Add an upgrade doc note about Glance show_multiple_locations #1012

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14 changes: 14 additions & 0 deletions doc/source/operations/upgrading.rst
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Expand Up @@ -94,6 +94,20 @@ custom configuration that uses the Keystone admin port. One such example is the
config for Ceph RGW in ``etc/kayobe/cephadm.yml``. Be sure to update any manual
references to the old port.

Glance show_multiple_locations disabled
---------------------------------------

Kolla Ansible no longer sets ``show_multiple_locations = True`` in Glance by
default when Glance's Ceph RBD backend is enabled. This was applied as a fix
but operators must note that this, in turn, disables Cinder and Nova's
optimisations. In particular, this can increase instance creation times due to
a lack of copy-on-write.

On the other hand, these optimisations might have been causing other trouble
for operators. Please see `LP#1992153
<https://bugs.launchpad.net/kolla-ansible/+bug/1992153>`__. Operators relying
on this feature can set the flag themselves using service config overrides.

Known issues
============

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