[Users] [vdsm] glusterfs and ovirt

Dor Laor dlaor at redhat.com
Mon May 21 06:55:51 UTC 2012

On 05/21/2012 06:15 AM, Bharata B Rao wrote:
> 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.

/me apologize for the useless noise, I'm using a new thunderbird plugin 
that collapses quotes and it made me loss the context.

> Regards,
> Bharata.

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