On 06/06/2016 11:02 AM, Yaniv Kaul wrote:
On Mon, Jun 6, 2016 at 7:23 PM, Hayley Swimelar <hayley@linbit.com> wrote:
On 06/04/2016 10:40 PM, Barak Korren wrote:
We are looking for advice on how best to have oVirt communicate with DRBD Manage and we have come to two options:
My vote would be for native support rather then a Cinder based one. I don't have any hard numbers, but it seems to me the adoption of OpenStack technologies for use with oVirt is not as widespread as one may hope.
But what sort of user experience and system architecture is intended? Is configuration of volumes planned to be done directly from the oVirt UI?
Once a DRBD Manage storage cluster is set up, oVirt would handle the management of DRBD volumes.
While oVirt can do a little Gluster volume management for now, it
seems it was done because it some point it was thought that oVirt would be the primary management UI for Gluster. AFAIK Gluster is now getting its own UI.
The DRBD Manage daemon ships with a command line utility which is the UI for interacting with DRBD 9. I do not believe that there is a stand alone DRBD GUI planned at this time.
Is using the CLI considered a 'stable API' ? (or perhaps it can output a JSON or something that can be considered as such)?
oVirt wouldn't use the CLI, it would talk directly to the underlying DRBD Manage process (drbdmanaged) via D-Bus. As far as setting up the cluster initially, the DRBD Manage client (CLI) is designed to be used by the end user, so it's pretty user-friendly.
At least for now, the user most likely will prepare a DRBD Manage cluster up to the point where it's ready to start creating/assigning volumes and then oVirt will take over from there.
As far as using DRBD for backing oVirt VMs, this seems to already be
working. The oVirt CI system (which runs on top of oVirt) had been using a DRBD-backed NFS storage for years...
The most recent release of DRBD contains new features that allow it to integrate more directly with virtualization/cloud platforms. So VMs could have DRBD-backed storage without additional overhead from NFS.
Via RADOS pools?
The DRBD devices would be attached over the network, similar to the way they are in Cinder: https://www.drbd.org/en/doc/users-guide-90/s-openstack-transport-protocol
-- Hayley Swimelar LINBIT | Keeping the Digital World Running DRBD — Corosync — Pacemaker +1-503-573-1262 x212 _______________________________________________ Devel mailing list Devel@ovirt.org http://lists.ovirt.org/mailman/listinfo/devel
-- Hayley Swimelar LINBIT | Keeping the Digital World Running DRBD — Corosync — Pacemaker +1-503-573-1262 x212