Re: [Xen-devel] RE: drdb support / xend locking for live migration

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sat, Jan 29, 2011 at 12:12:50PM +1100, James Harper wrote:
> > 
> > On Thu, 27 Jan 2011, Kamala Narasimhan wrote:
> > > > - phy:/path/to/device
> > > > - file:/path/to/file
> > > > - tap:/path/to/file
> > >
> > > Along with phy, file and tap for block device types there appear to
> be a
> > 'drdb' option too.  Do we actively support it?  If so do we treat it
> same as
> > 'phy' and use blkback for backend?
> > 
> > Yes, I think so. Given his recent work on drdb support in qemu, maybe
> > James can comment on this.
> > 
> 
> Aside from the qemu problems I posted a patch for, drbd works great
> under Windows. I haven't tested live migration (don't have a pair of
> servers with compatible CPU's) so I don't know if that works. I also
> don't allow multiple-primary as single-primary is the only locking
> mechanism I have at this time to make sure the same DomU isn't started
> on two machines concurrently.
> 

IIRC Novell has some additional xend locking patch included
in SLES11 Xen .. I guess it was this one:
http://lists.xensource.com/archives/html/xen-devel/2008-08/msg00196.html
http://serverfault.com/questions/21699/how-to-manage-xen-virtual-machines-on-shared-san-storage

Also Oracle has some locking patch: 
http://lists.xensource.com/archives/html/xen-devel/2009-08/msg00101.html

-- Pasi


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