On 04/12/2018 10:25 PM, 李俊波 wrote: > Hello Nova, Cinder developers, > > > > I would like to ask you a question concerns a Cinder patch [1]. > > > > In this patch, it mentioned that RBD features were incompatible with > multi-attach, which disabled multi-attach for RBD. I would like to know > which RBD features that are incompatible? > > > > In the Bug [2], yao ning also raised this question, and in his envrionment, > it proved that they did not find ant problems when enable this feature. > > > > So, I also would like to know which features in ceph will make this feature > unsafe? > > > > [1] https://review.openstack.org/#/c/283695/ > > [2] https://bugs.launchpad.net/cinder/+bug/1535815 > > > > > > Best wishes and Regards > > junboli > >
Hi, As noted in the comment in the code [1] -- the exclusive lock feature must be disabled. However, this feature is required for RBD mirroring [2], which will be the basis of Cinder volume replication for RBD. We are currently prioritizing completing support for replication over multi-attach for this driver, since there is more demand for that feature. After that, we will look more at multi-attach and how to let deployers choose to enable replication or multi-attach. [1] https://git.openstack.org/cgit/openstack/cinder/tree/cinder/volume/drivers/rbd.py?id=d1bae7462e3bc#n485 [2] http://docs.ceph.com/docs/master/rbd/rbd-mirroring/#enable-image-journaling-support Thanks, Eric __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev