WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

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

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-users] iscsi vs nfs for xen VMs
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Sun, 30 Jan 2011 01:44:06 +0200
Cc: Christian Zoffoli <czoffoli@xxxxxxxxxxx>, Jia Rao <rickenrao@xxxxxxxxx>, xen-users@xxxxxxxxxxxxxxxxxxx
Delivery-date: Sat, 29 Jan 2011 15:45:00 -0800
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <AEC6C66638C05B468B556EA548C1A77D01BB9317@trantor>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <20110129150142.GC2754@xxxxxxxxxxx> <AEC6C66638C05B468B556EA548C1A77D01BB9317@trantor>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mutt/1.5.18 (2008-05-17)
On Sun, Jan 30, 2011 at 10:41:23AM +1100, James Harper wrote:
> > 
> > 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).
> > 
> 
> How sure are you of this? Every write to the original or the snapshot 
> involves a potential metadata update. If the original is mounted on one node 
> and the snapshot on another, I'm pretty sure that it would all go to crap 
> really really quickly.
> 
> Have you actually tried this???
> 

It's widely used.

Citrix XenServer (and XCP) do it like that, and also the 
Xen based VirtualIron did it like that.

-- Pasi


_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users