[ovirt-users] posix compliant fs with ceph rbd

[Nir Soffer]

On Wed, Jan 25, 2017 at 8:55 PM, Yura Poltoratskiy
<yurapoltora at gmail.com> wrote:
> Hi,
>
> I want to use Ceph with oVirt in some non standard way. The main idea is to
> map rbd volume to all computes and to get the same block device, say
> /dev/foo/bar, across all nodes, and then use "POSIX compliant file systems"
> option to add Storage Domain.
>
> Am I crazy?

Yes

> If not, what should I do next: create a file system on top of
> /dev/foo/bar, say XFS, and add DATA Domain as POSIX compliant? Does it work,
> I mean does oVirt compatible with not clustered file system in this
> scenario?

This can work only for clustered file system, not with XFS. Double mounting will
quickly corrupt the file system.

> Mostly, I want to use rbd like oVirt do with iSCSI storage just to have
> scalability and high availability (for example, when one storage node
> failed).

You have two ways to use ceph:

- via cinder - you will get best performance and scalability
- via cephfs - you will get all features, works like fault tolerant NFS

Nir

> Thanks for advice.
>
> PS. Yes, I know about Gluster but want to use Ceph :)
>
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