<div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Wed, 21 Jun 2017 at 20:08 Jason Dillaman <<a href="mailto:jdillama@redhat.com">jdillama@redhat.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Wed, Jun 21, 2017 at 12:32 PM, Jon Bernard <<a href="mailto:jobernar@redhat.com" target="_blank">jobernar@redhat.com</a>> wrote:<br>
> I suspect you'd want to enable layering at minimum.<br>
<br>
I'd agree that layering is probably the most you'd want to enable for<br>
krbd-use cases as of today. The v4.9 kernel added support for<br>
exclusive-lock, but that probably doesn't provide much additional<br>
benefit at this point. The striping v2 feature is still not supported<br>
by krbd for non-basic stripe count/unit settings.<br></blockquote><div><br></div><div>The newer cinder ceph replication features use journaling and exclusive-lock</div><div>(see [0]), so any krbd based driver would not be able to support this</div><div>feature right now.</div><div><br></div><div>[0] <a href="http://ceph.com/planet/openstack-cinder-configure-replication-api-with-ceph/">http://ceph.com/planet/openstack-cinder-configure-replication-api-with-ceph/</a> </div></div></div>