Re: [Xen-users] Gluster 1.3.12 and Xen! -> SOLVED!

[Enrico Valsecchi <admin@xxxxxxxxxx>]

After some test,
I have solved problem to use a SAN based on GlusterFS to store xen images.
All work very very fine.

Software used:
Xen v. 3.2 build under Centos 5.2 X_64

GlusterFS v. 1.3.12

Configure GlusterFS in your favorite mode (AFR, Mirror, Unify, is not a 
problem)
Mount GlusterFS in client environment with DISABLE DIRECTIO:

- version 1.3: glusterfs -d disable -f /path-of-volume-spec-file

- version 1.4: glusterfs --disable-direct-io-mode -f 
/path-of-volume-spec-file
Now, if Gluster work correctly, you can store Xen Image file into space 
allowed by GlusterFS
You can specify, in domU configuration file, disk type:

tap:aio:/GlusterFs-mount-point/domU-image-disk, hda, etc etc etc etc 
(suggested method)
OR

file:/GlusterFs-mount-point/domU-image-disk, hda, etc etc etc etc

Bye,

Enrico

> On Mon, 24 Nov 2008, Enrico Valsecchi wrote:
>
> > Dear All,
> >
> > I have installed Gluster FS v. 1.3.12 on 2 server with Debian 4.05,
> > in AFR with client side replication, explained in this page:
> > http://www.gluster.org/docs/index.php/Setting_up_AFR_on_two_servers_with_client_side_replication 
> >
> > Tested to work!
> >
> > :-)
> >
> > Now, my idea:
> >
> > Use a Xen Hypervisor with image disk data for DomU machines on GlusterFS
> > repository
> Your going to run into a lot of issues with loop files. Unfortunately 
> Gluster does not support tap:aio, so the only thing left is look with 
> issues. :( I wish so much that this was not the case, but after 
> working on this for about 6 months I ended up going with DRBD. It is 
> much more limited then Gluster, but stable as a rock.
> > <>
> Nathan Stratton                                CTO, BlinkMind, Inc.
> nathan at robotics.net                         nathan at blinkmind.com
> http://www.robotics.net                        http://www.blinkmind.com

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