Re: [Xen-users] xm save -c

["Todd Deshane" <deshantm@xxxxxxxxx>]

On Sat, Sep 27, 2008 at 2:48 PM, Nick Couchman <Nick.Couchman@xxxxxxxxx> wrote:
> I'm tossing around the idea of creating a sort of "VDI" setup with Xen.  One
> thing that I would like to do in this scenario is "checkpoint" the user's VM
> at a certain interval so that if something bad happens they can go right
> back to the latest point time - maybe a half-hour earlier or something like
> that.  I was trying to use "xm save -c <Domain> <File>" to do this, but the
> domain pauses while the contents of memory are saved off to disk.  I was
> wondering if anyone knows of a way to "checkpoint" without pausing the
> domain?  I can't do something like an hourly checkpoint if the domain pauses
> every hour - the users on the domUs would kill me.  Is "seamless
> checkpointing" something that's being developed, something that can be done
> another way, or something I should just give up on now?
>

It is on the TODO list (last updated Jan 08):
http://wiki.xensource.com/xenwiki/XenTodoList

I think the LVM snapshots should be a good way.

Another idea is to use a ZFS domain.

I'll look into this more soon.

A quick google search and remembering back to a previous Xen summit,
there have been attempts. I don't know the status of them though.

Feel free to float around ideas and discussion about this type of thing
on the xen-research list.

We should also do a better search of the summits and mailing lists
to see what has been done and also check roadmaps and ask xen-
devel if anybody is working on it.

Cheers,
Todd

-- 
Todd Deshane
http://todddeshane.net
check out our book: http://runningxen.com

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