[CentOS-virt] IBM GPFS filesystem

Fri Dec 3 06:08:51 UTC 2010
Fabian Arrotin <fabian.arrotin at arrfab.net>

Benjamin Franz wrote:
> On 12/02/2010 12:58 PM, compdoc wrote:
>> [>]...live migration...?
> No. You need a shared filesystem. Which pretty much leaves you on either 
> NFS or a clustered filesystem. 

Totally wrong ! If you have never tested it , try it (and try to 
understand clvmd) before saying that it doesn't work !
If you've never tried it, that means you've never played with the rhcs 
stack, because even if you want to put gfs/gfs2 on top, you still need 
clvmd to have a consistent logical volume management across all the 
nodes in the hypervisor cluster ...
It seems to me that most people wanting to have a clusterfs 
(gfs/gfs2/ocfs2/whateverfs) on top of a shared storage want that just 
because they are used to that  thing that Vmware did for a shared 
storage : vmfs on top of a shared storage and file-based container 
(.vmdk) for the virtual machines.
I've installed several solutions based purely on lvm

Please compare all the solutions and you'll easily find that on a 
performance/IO level you'll be always faster to put put extra layer 
between the VM storage and the shared storage

Fabian Arrotin