Re: [Xen-users] small cluster storage configuration?

[Miles Fidelman <mfidelman@xxxxxxxxxxxxxxxx>]

Bart Coninckx wrote:
> On 10/10/11 15:18, Miles Fidelman wrote:
> > James Harper wrote:
> > > Bart Coninckx wrote:
> > > > DRBD does not do 4 nodes. If you split in two clusters you cannot
> > > > cross migrate, unless you set up the storage on each node in some
> > > > way, bu thow are you going to replicate?
> > Well, yes, ... that's sort of why I'm asking the question :-)
> The question implies that I don't see a possibility for this.
That's why I'm trying to avoid using DRBD - looking for an alternative 
that will
replicate data across all four nodes, and allow for continued operation 
if one
(or possibly two) node(s) fail.  It looks like GlusterFS, VastSky, and 
Sheepdog would
do this but development on VastSky seems to have stalled, and Sheepdog 
is KVM-only.
Alternate might be to mount everything via iSCSI or AoE, run md Raid10 
across the mess
of drives, or some such.
> > Which leads to two follow-up questions:
> >
> > 1. Can I assume that you're both suggesting a 4-node storage cluster,
> > and a 4-node VM cluster - running on the same 4 computers? If so, that's
> > sort of what I'm aiming for.
> No, we're suggesting two 2-node clusters, one for storage, one for 
> virtualization.
Ok... that's what I'm trying to avoid - mostly because that would make 
half my drives unavailable.
> > 2. What software are you running for your storage cluster?
> I'm running IET. Next project I would try AoE though.
Running anything on top of that in the way of a cluster file system?

Thanks,

Miles

--
In theory, there is no difference between theory and practice.
In<fnord>  practice, there is.   .... Yogi Berra



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