Thanks Matthias,

Ceph iSCSI is indeed supported but it introduces an overhead for running LIO gateways for iSCSI.
CephFS works as a posix domain, if we could get a posix domain to work as a master domain then we could run a self-hosted engine on it.
Ceph RBD ( rbd-nbd hopefully in future ) could be used with cinderlib and we have got a self-hosted infrastructure with Ceph.

I am hopeful that when cinderlib integration is mature enough to be out of Tech preview, there will be a way to migrate old cinder disks to new cinderlib.

PS: About your large deployment, go OpenStack or OpenNebula if you like. Proxmox clustering isn't very great, it doesn't have a single controller and uses coro-sync based clustering which isn't very great.

Cheers,
Shantur

On Fri, Jan 22, 2021 at 10:36 AM Matthias Leopold <matthias.leopold@meduniwien.ac.at> wrote:
I can confirm that Ceph iSCSI can be used for master domain, we are
using it together with VM disks on Ceph via Cinder ("old style"). Recent
developments concerning Ceph in oVirt are disappointing for me, I think
I will have to look elsewhere (OpenStack, Proxmox) for our rather big
deployment. At least Nir Soffer's explanation for the move to cinderlib
in another thread (dated 20210121) shed some light on the background of
this decision.

Matthias

Am 19.01.21 um 12:57 schrieb Gianluca Cecchi:
> On Tue, Jan 19, 2021 at 12:20 PM Benny Zlotnik <bzlotnik@redhat.com
> <mailto:bzlotnik@redhat.com>> wrote:
>
>      >Thanks for pointing out the requirement for Master domain. In
>     theory, will I be able to satisfy the requirement with another iSCSI
>     or >maybe Ceph iSCSI as master domain?
>     It should work as ovirt sees it as a regular domain, cephFS will
>     probably work too
>
>
> Ceph iSCSI gateway should be supported since 4.1, so I think I can use
> it for configuring the master domain and still leveraging the same
> overall storage environment provided by Ceph, correct?
>
> https://bugzilla.redhat.com/show_bug.cgi?id=1527061
>
> Gianluca
>
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--
Matthias Leopold
IT Systems & Communications
Medizinische Universität Wien
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