Document image cache manager limitation
Document image cache manager limitation

When the compute hosts are using different CSVs, Nova must be
configured not to delete unused images since its image caching
mechanism can't properly track the image files in this case.

In particular, instances that were moved to other hosts won't be
tracked and their base images might be removed.

This is not a concern when not using shared storage or when using
a single shared folder (which might as well be a CSV).

Change-Id: If730f59473df576fd32eae5b930c60b1125d7ff1

openstack/compute-hyperv,openstack/compute-hyperv