[Users] [vdsm] glusterfs and ovirt

Bharata B Rao bharata.rao at gmail.com
Mon May 21 03:15:11 UTC 2012

On Sun, May 20, 2012 at 4:57 PM, Dor Laor <dlaor at redhat.com> wrote:
> On 05/18/2012 04:28 PM, Deepak C Shetty wrote:
>> On 05/17/2012 11:05 PM, Itamar Heim wrote:
>>> On 05/17/2012 06:55 PM, Bharata B Rao wrote:
>>>> I am looking at GlusterFS integration with QEMU which involves adding
>>>> GlusterFS as block backend in QEMU. This will involve QEMU talking to
>>>> gluster directly via libglusterfs bypassing FUSE. I could specify a
>>>> volume file and the VM image directly on QEMU command line to boot
>>>> from the VM image that resides on a gluster volume.
>>>> Eg: qemu -drive file=client.vol:/Fedora.img,format=gluster
>>>> In this example, Fedora.img is being served by gluster and client.vol
>>>> would have client-side translators specified.
>>>> I am not sure if this use case would be served if GlusterFS is
>>>> integrated as posixfs storage domain in VDSM. Posixfs would involve
>>>> normal FUSE mount and QEMU would be required to work with images from
>>>> FUSE mount path ?
>>>> With QEMU supporting GlusterFS backend natively, further optimizations
>>>> are possible in case of gluster volume being local to the host node.
>>>> In this case, one could provide QEMU with a simple volume file that
>>>> would not contain client or server xlators, but instead just the posix
>>>> xlator. This would lead to most optimal IO path that bypasses RPC
>>>> calls.
>>>> So do you think, this use case (QEMU supporting GlusterFS backend
>>>> natively and using volume file to specify the needed translators)
>>>> warrants a specialized storage domain type for GlusterFS in VDSM ?
>>> I'm not sure if a special storage domain, or a PosixFS based domain
>>> with enhanced capabilities.
>>> Ayal?
>> Related Question:
>> With QEMU using GlusterFS backend natively (as described above), it also
>> means that
>> it needs addnl options/parameters as part of qemu command line (as given
>> above).
> There is no support in qemu for gluster yet but it will be there not far
> away

As I said above, I am working on this. Will post the patches shortly.

http://bharata.sulekha.com/blog/posts.htm,  http://raobharata.wordpress.com/

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