[Users] Ceph / rbd and ovirt

[Josh Logan]

On Sun, Sep 23, 2012 at 8:41 AM, Itamar Heim <iheim at redhat.com> wrote:

> On 09/23/2012 05:33 PM, Josh Logan wrote:
>
>>
>> On Sun, Sep 23, 2012 at 6:10 AM, Itamar Heim <iheim at redhat.com
>> <mailto:iheim at redhat.com>> wrote:
>>
>>     On 09/22/2012 08:58 AM, Josh Logan wrote:
>>
>>
>>         I'm currently setting up an ovirt cluster and so far it looks
>>         good.  I
>>         like the integration with Foreman http://theforeman.org/ .
>>
>>         I would like to use Ceph / rbd for my storage.  I saw some
>>         mention of
>>         patches coming in May, but I did not find any new posts.
>>
>>         What is the status of this work?  Is there some patches I can
>>         try out?
>>         I have a working Ceph cluster and a working ovirt cluster, I
>>         just need a
>>         way to bring them together.
>>
>>         Thanks, JOSH
>>
>>
>>
>>     I don't remember any active work on this right now (for sure nothing
>>     like the gluster integration being done).
>>     but iiuc, ceph provides posixfs support - did you try creating a
>>     posixfs based storage domain?
>>     (you would need a "full" host (not ovirt-node) to install ceph
>>     client components on).
>>
>>     Thanks,
>>         Itamar
>>
>>
>>
>> I am doing my work on Fedora 17 hosts, not ovirt-node, since I know this
>> will need more OS support.
>>
>> There are a few different Ceph filesystems.  But the posix based one is
>> the least ready for production.  The rbd filesystem is integrated into
>> qemu and libvirt is the most suited for VM images.
>>
>> Are the Gluster patches available?  I would like to see what that
>> feature looks like and if I can modify them for Ceph.
>> If there is a better filesystem to investigate please let me know.
>>
>> Thanks, JOSH
>>
>>
> gluster as a native storage domain (rather than posixfs)  is still in
> reviews (and has patches only for vdsm side).
> http://gerrit.ovirt.org/#/c/**6856/ <http://gerrit.ovirt.org/#/c/6856/>
>
> you can also use NFS in the meantime if relevant for ceph.
>
>
Thanks for the pointer.  I'll follow that and see what I learn.

The vdsm side may be similar since both are network disk device.  There are
only 2 steps needed to start up a VM with rbd.

qemu-img create -f rbd rbd:data/host1 10G

Then to start the image for qemu add -drive
file=rbd:data/host1,if=none,id=drive-virtio-disk0,format=raw

or within libvirt:
    <disk type='network' device='disk'>
      <driver name='qemu' type='raw'/>
      <source protocol='rbd' name='data/host1'/>
      <target dev='vda' bus='virtio'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05'
function='0x0'/>
    </disk>

So the steps are simple, and maybe Gluster is more complex then I should
use as an example.

Thanks, JOSH
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