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Re: [Xen-devel] [PATCH] Add dm-userspace to the Xen kernel

  • To: "Anthony Liguori" <aliguori@xxxxxxxxxx>
  • From: "Niraj Tolia" <ntolia@xxxxxxxxx>
  • Date: Fri, 16 Jun 2006 15:41:00 -0400
  • Cc: Dan Smith <danms@xxxxxxxxxx>, Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 16 Jun 2006 12:41:24 -0700
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On 6/16/06, Anthony Liguori <aliguori@xxxxxxxxxx> wrote:
You probably want to check out drbd.  A number of people have used it
successfully to do storage migration with Xen domains.

DRBD has a number of disadvantages. The last time I checked, it only mirrors data between two nodes. Further, it requires a complete copy of the disk to be present on both nodes.



Anthony Liguori

Niraj Tolia wrote:
> Hi Dan,
> I had a question or two about dm-userspace. It looks very interesting
> and I hope to find time sometime soon to experiment with it. My
> question was, would this allow me to export a logical disk without
> having all the data present locally. The scenario I am thinking of
> would be applicable for VM migration across WANs.
> In that case, if I was to represent a virtual disk as a number of
> logical blocks, I could have the userspace application page the
> logical blocks in on demand. This would be useful when a VM migrates
> to a machine it has never been to earlier. Does this make sense? Would
> it work with dm-userspace?
> Cheers,
> Niraj
> On 6/15/06, *Dan Smith* <danms@xxxxxxxxxx <mailto:danms@xxxxxxxxxx>>
> wrote:
>     This patch adds dm-userspace to the -xen Linux kernel.  I'd like to
>     get it into the tree so that people that want to can play with it.
>     Anyone wishing to to do so can download the tools separately, but they
>     need the kernel module to be able to use it.
>     I've updated the code for and tested it on x86_64.
>     The tools are available here:
>       http://static.danplanet.com/dm-userspace/libdmu-0.3.tar.gz
>     <http://static.danplanet.com/dm-userspace/libdmu-0.3.tar.gz>
>       http://static.danplanet.com/dm-userspace/cowd-0.3.tar.gz
>     --
>     Dan Smith
>     IBM Linux Technology Center
>     Open Hypervisor Team
>     email: danms@xxxxxxxxxx <mailto:danms@xxxxxxxxxx>
>     _______________________________________________
>     Xen-devel mailing list
>     Xen-devel@xxxxxxxxxxxxxxxxxxx <mailto:Xen-devel@xxxxxxxxxxxxxxxxxxx>
>     http://lists.xensource.com/xen-devel
> --
> http://www.cs.cmu.edu/~ntolia < http://www.cs.cmu.edu/%7Entolia>
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