Re: [Xen-users] Live VM migration

[Roberto Bifulco <roberto.bifulco2@xxxxxxxx>]

Dear Payal,

live migration of a VM among different IP subnets is possible if you still have a shared storage location for the VM's image (i.e., it works!).

The problem is that you loose the VM's network connectivity because of the IP subnet change, so you have a working VM, but with no network connectivity.�

To make�again�the VM reachable on the network, you should change the VM's network configuration, that makes the migration not transparent to the VM itself.

I don't think that there are some "standard" solutions to this issue, anyway, there are some techniques that allow the transparent live migration of VM, even among different IP subnets, but you have to take into account the configuration of other �devices such as routers or switches. �

You can find some details on the problem and a possible solution here:�http://robertobifulco.it/node/752

Roberto �

2011/8/22 Payal Shah <payals@xxxxxxxxx>

Hello ,

Thank you for the reply. I got the results I was expecting.

I had one more question regarding open vSwitch and live VM migration.

Live VM migration requires that both the hosts should be in the same subnet. If the hosts are in different subnets then how can we do live VM migration? Can open vSwitch be used in this scenario?? Or is there any other virtual switch that can route the packets as per the new subnet?

Thank you in advance

On Wed, Aug 3, 2011 at 8:39 PM, George Shuklin <george.shuklin@xxxxxxxxx> wrote:

On XCP (1.1b, may be in XCP 1.0) there is a note in xensource.log about %% of migration.

And you can do xentrace in dom0 to see all hypercalls (but you must understand what they means to get needed information).

On 04.08.2011 00:42, Payal wrote:

I have two hosts as Xen Server named host A and host B in the same network. A
VM is created on Host A. Host A and B have a shared storage using NFS. While
doing migration from host A to host B, how can I see the memory pages being
migrated.
If I run a small continuous program on the VM residing on host A, will the
migration complete first or the sript running will complete first? How can I
see that data is going in clear text? Is there a tool to see the packets
going through? I tried using wireshark and spanning the ports, but I
couldn't infer much. ANy help on this appreciated. Thank you,

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Payal Shah
Dream as if you'll live forever, live as if you'll die today.

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Roberto Bifulco, Ph.D. Student
robertobifulco.it
COMICS Lab - www.comics.unina.it

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