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Re: [Xen-devel] How to get the persistent identifier of a domain?

  • To: "Ewan Mellor" <ewan@xxxxxxxxxxxxx>
  • From: "Lily Huang" <ushuanglily@xxxxxxxxx>
  • Date: Thu, 28 Dec 2006 12:14:48 -0500
  • Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Thu, 28 Dec 2006 09:14:32 -0800
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Thanks for your reply.

Here is my experimental setting. I start a domu, run "xm list --long", the uuid shown to me was (uuid 6cc8ab86-4ad4-7820-3326-53d666ff96aa). Then, I shut down this domu,  and start the same domu again. I got a different uuid:
(uuid 0c9ee2d6-4a9f-c0bf-989f-148bec284e15). You can see these two uuids are different.

I am using the latest xen-unstable.

Any further thought? If the persistent identifier does exists, do we have a programmable solution to get the persistent identifier (not command line, because it dump too much information and need  additional work to filter  the useless information)?


On 12/28/06, Ewan Mellor <ewan@xxxxxxxxxxxxx> wrote:
On Wed, Dec 27, 2006 at 11:09:43PM -0500, Lily Huang wrote:

> Hi,
> As we know, a domainU's domid may change after system reboots. Does Xen
> provide a persistent identifier for each domU? I tried UUID, but UUID also
> changes across reboots. Any idea on this? If Xen does provide such a
> mechanism to persistently identify a domain U? What is it?

Which UUID do you mean?  The one that xm list --long shows you as the
UUID for the domain certainly shouldn't change across reboots (it
doesn't for me).


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