[openstack-dev] OPENSTACK with CEPH storage backend cant down size an instance

Jon Bernard jbernard at tuxion.com
Fri Jul 24 17:03:26 UTC 2015

* James Galvin <jgalvin at servecentric.com> wrote:
> Hi All
> I am having some trouble with down sizing an instance,
> I can resize the instance from say small flavour to medium flavour but
> when trying to resize the instance back from medium to small
> I get the following :
> Error: Failed to perform requested operation on instance "jg-10", the
> instance has an error status: Please try again later [Error: Flavor's
> disk is too small for requested image.].
> I am using ceph as the storage backend clustered over 3 nodes with 3
> pools "volumes" "vms" "images"

Someone will correct me if I'm wrong, but I believe we do not support
reducing the size of a volume, as this would require an FS resize.
Shrinking a filesystem will often leave you with a suboptimal on-disk
layout.  I believe this is a general openstack rule, and not just
specific to RBD volumes.


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