Re: [Xen-users] xm save -c

["Fabian Flägel" <fabigant@xxxxxxxxxxxxxx>]

It _should_ work with qcow, but does not. At least not for me. I use
Ubuntu 8.04 LTS with Xen 3.2.1 and 2.6.24-41 and it does not work to
attach a qcow image to a vm. And therefore the vm sees no disk while
booting. If you find a solution for this, please let me know.

Regards
Fabian

2008/10/1 Nick Couchman <Nick.Couchman@xxxxxxxxx>:
> Thanks, Todd,
> I'm less concerned about the disk and more about Xen being able to do the 
> memory save "seamlessly" so that there isn't any pause for the user while the 
> save is completed (or at least not near as long as it is now).  The disk 
> would be nice, too, although I'm using OCFS2 and not LVM or ZFS for my domUs, 
> so I'm not sure how much that would help me.  Any chance it could be 
> implemented with Qcow, as well?  VMware does something like this and then 
> quickly changes out the disk that the VM sees from the original to the qcow 
> image.
>
> -Nick
>
>>>> On 2008/09/30 at 22:32, "Todd Deshane" <deshantm@xxxxxxxxx> wrote:
> 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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