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

To: Christian Zoffoli <czoffoli@xxxxxxxxxxx>
Subject: Re: [Xen-users] iscsi vs nfs for xen VMs
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Sat, 29 Jan 2011 17:01:42 +0200
Cc: "xen-users@xxxxxxxxxxxxxxxxxxx" <xen-users@xxxxxxxxxxxxxxxxxxx>, Jia Rao <rickenrao@xxxxxxxxx>
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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 

-- 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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