Re: [Xen-users] live migration on SAN

[Chris Richardson <techlist@xxxxxxxxxxxx>]

I am currently doing live migration with a san backend. I use ocfs2 on 
the dom0s to share the domu between them selves.
Fast Jack wrote:
> Hi,
>
> Currently I'm trying to set up a number of servers with Xen 3.0. To
> ensure high availability, this setup should support live migration of
> the domUs between the hardware-nodes.
>
> On the hardware side we have a number of servers connected to a SAN
> via fibre channel. The problem now is that I can't find any definitive
> requirements for the virtual block devices and filesystems presented
> to the domUs. The documentations doesn't say much on that subject.
> I have read a number of example setups ranging from ext3 in LVM
> (non-cluster) volumes on the SAN-disk to cluster-aware solutions based
> on e.g. OCFS2.
>
> As far as I can tell no concurrent access to each dumUs storage from
> multiple hosts takes place during live migration or otherwise. So I'm
> wondering whether cluster-save technology like OCFS2, GFS or CLVM are
> really necessary to ensure that the domUs filesystem is not corrupted
> during migration. If possible I would like to avoid using
> cluster-software as it brings with it new points of failure.
>
> So my questions are:
> What are the actual requirements on the domUs storage?
> Could you give me a few examples of thoroughly tried and tested setups?
>
> Thanks in advance
>
> Björn
>
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> http://lists.xensource.com/xen-users



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