Re: [Xen-users] what do you recommend for cluster fs ??

[Tom Mornini <tmornini@xxxxxxxxxxxxxx>]

On Sep 24, 2006, at 11:39 AM, Anthony Wright wrote:

> Tom Mornini wrote:
>
> > On Sep 23, 2006, at 7:44 AM, Anand Gupta wrote:
> >
> > > I was wondering what people use / recommend for a cluster fs for  
> > > use with xen ?
> > We use GFS.
> >
> > > Also with this cluster fs, will the domU's be using flat files /  
> > > lvm ? (it should be the former as per my guess since these flat  
> > > files will be stored on the cluster fs, but then won't  
> > > performance hit will be there for these domU's ? )
> > We use CLVM.
> I hear talk of CLVM, but I'm trying to understand what the  
> difference is between CLVM and normal LVM, where the CLVM software  
> is and what I have to do to turn my LVM system into a CLVM?????
It's part of the Red Hat Cluster Suite.

> I'd also be interested to know if you can combine CLVM with a dm- 
> raid solution, to create a clustered raid device? I understand that  
> dm-raid0/1 has been released, and there's a dm-raid4/5 in alpha at  
> the moment.
I'm quite certain that dm-raid doesn't work in a clustered  
environment yet.
I have a feeling you're anxious (as are many) for a solution like this:

http://sourceware.org/cluster/ddraid/

Unfortunately there's no date on the article, and it hasn't been  
updated in months.
If you're looking for something useful *today*, then I'd recommend a  
SAN solution. The AoE SAN solution from Coraid that I mentioned  
earlier isn't much more expensive than plain ATA disks, so it's not  
prohibitive.
--
-- Tom Mornini


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