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

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] RE: drdb support / xend locking for live migration
From: Pasi Kärkkäinen <pasik@xxxxxx>
Date: Sat, 29 Jan 2011 14:53:48 +0200
Cc: Kamala Narasimhan <kamala.narasimhan@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, "Kamala Narasimhan \(3P\)" <kamala.narasimhan@xxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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References: <4D407A06.1050902@xxxxxxxxx> <alpine.DEB.2.00.1101271506410.7277@kaball-desktop> <4D41EE90.5000907@xxxxxxxxx> <alpine.DEB.2.00.1101281256060.7277@kaball-desktop> <AEC6C66638C05B468B556EA548C1A77D01BB930F@trantor>
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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:

Also Oracle has some locking patch: 

-- Pasi

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