Re: [Xen-users] iSCSI and LVM

[Bart Coninckx <bart.coninckx@xxxxxxxxxx>]

On Monday 14 June 2010 18:56:58 Serge Fonville wrote:
> > Can you use LVM with NFS? Is NFS not slower than iSCSI?
> 
> LVM over NFS is not possible.
> LVM needs to be applied to a blockdevice
> 
> Fortunately, you can sitll use LVM on the storage server.
> 
> NFS is often considered slower, due to that it adds an additional
> layer to the communication.
> 
> This does not necessarily negatively impact the performance in such a
> way that it should be considered a deal-breaker.
> If you expect to constantly utilize over 70% of your bandwidth, you
> may be better of using iSCSI.
> Then again, if you are utilizing that much, you should probably
> rethink your setup.
> 
> since I currently know very little about your expected load.
> I can not give you a definitive answer.
> 
> But looking into using NFS for your VMs should at least be looked in
> to thoroughy.
> 
> HTH
> 
> Regards,
> 
> Serge Fonville
> 
I suppose NFS requires image based access, which I understand is less 
performant.


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