[openstack-dev] Required Ceph rbd image features

James Page james.page at ubuntu.com
Fri Jun 23 09:53:42 UTC 2017

On Wed, 21 Jun 2017 at 20:08 Jason Dillaman <jdillama at redhat.com> wrote:

> On Wed, Jun 21, 2017 at 12:32 PM, Jon Bernard <jobernar at redhat.com> wrote:
> > I suspect you'd want to enable layering at minimum.
> I'd agree that layering is probably the most you'd want to enable for
> krbd-use cases as of today. The v4.9 kernel added support for
> exclusive-lock, but that probably doesn't provide much additional
> benefit at this point. The striping v2 feature is still not supported
> by krbd for non-basic stripe count/unit settings.

The newer cinder ceph replication features use journaling and exclusive-lock
(see [0]), so any krbd based driver would not be able to support this
feature right now.

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