Re: [Xen-users] iscsi vs nfs for xen VMs

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Wed, Jan 26, 2011 at 11:38:52AM +0100, Christian Zoffoli wrote:
> Hi,
> 
> if you want to push on performance the best one is:
> 
> CLVM over iSCSI
> 

And if you need snapshots, just over normal LVM over shared iSCSI LUN.
(in this case your management toolstack needs to take care of locking LVM 
control).

-- Pasi

> if you need fully redundancy you have to double everything:
> - switches
> - network ports
> - PSUs
> 
> and
> 
> - storages.
> 
> If you want to a completely redundant storage solution you can use DRBD
> in active-active
> 
> Just some notes:
> - VMs over files over NFS is slow (only some vendors have a relative
> fast NFS appliance).
> - VMs over files over a cluster FS is slow
> 
> everytime you add a layer (in particular a clustered FS layer) your
> performances drop down ... so make it simple
> 
> 
> Best regards,
> Christian
> 
> P.S. another interesting approach would be NFS over RDMA (infiniband)
> ...most of the advantages of NFS with less disadvantages compared to NFS
> over TCP/IP
> 
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