[Gluster-users] Block storage with Qemu-Tcmu

[Prasanna Kalever]

On Mon, Nov 7, 2016 at 1:53 PM, Lindsay Mathieson
<lindsay.mathieson at gmail.com> wrote:
> On 7 November 2016 at 17:01, Prasanna Kalever <pkalever at redhat.com> wrote:
>> Yet another approach to achieve Gluster Block Storage is with Qemu-Tcmu.
>
>
> Thanks Prasanna, interesting reading.
>
> From a quick scan, there doesn't seem to be any particular advantage
> over qemu using gfapi directly? Is this more aimed at apps that can't
> use gfapi such as vmware or as a replacement for NFS?
>

As mentioned in the conclusion part in the blog, the advantage here is
easy snapshots.
Qemu-tcmu will come up with '--snapshot' option (work still in
progress) as much like qemu-img.
Supporting this within gluster needs additional maintenance of
qemu-block xlator which is the clone of qcow2 spec implementation,
which could be more work.

Also the qemu gluster protocol driver (access gfapi) is more mature and tested.

--
Prasanna

> --
> Lindsay