Open Stack

>   * There's a very serious known issue with the image cache cleanup
>     code when you're using shared storage:
>
>       https://bugs.launchpad.net/nova/+bug/1078594
>
>     The fix is invasive and risky, but there's a known workaround (i.e.
>     disable the image cache manager) which Vish has documented in the
>     release notes.
>
>     We may just disable the image cache manager by default for the
>     release.

Not may, but must because release note is not enough to cover possible
data loss, even if in specific configuration.
If https://review.openstack.org/#/c/16726/ is not merged, then we need
alternative patch setting image_cache_manager_interval default to 0

Cheers,
Alan