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Re: [Xen-users] xm save -c

To: "Mike Sun" <msun@xxxxxxxxxx>
Subject: Re: [Xen-users] xm save -c
From: "Fabian Flägel" <fabigant@xxxxxxxxxxxxxx>
Date: Fri, 14 Nov 2008 18:51:08 +0100
Cc: xen-research@xxxxxxxxxxxxxxxxxxx, XEN Mailing List <xen-users@xxxxxxxxxxxxxxxxxxx>, Nick Couchman <Nick.Couchman@xxxxxxxxx>
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Hi Mike,

ok, i'll have to wait... :)

Even if your paper is not ready yet, may i ask which COW do you use? I tried qcow but this doesn't seem to be supported under Ubuntu 8.04 with Xen 3.2.1.


2008/11/14 Mike Sun <msun@xxxxxxxxxx>
Hi Fabian,

We're still working to finish the paper first, but I'll certainly
cleanup and provide the prototype code after we're done.


On Fri, Nov 14, 2008 at 4:42 AM, Fabian Flägel <fabigant@xxxxxxxxxxxxxx> wrote:
> Hi Mike,
> i'd like to see your code. :)
> Regards
> Fabian
> 2008/11/14 Mike Sun <msun@xxxxxxxxxx>
>> Hi Nick,
>> > 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?
>> I've been working on something for my research that probably addresses
>> what you're looking for: low latency/downtime checkpointing.  There
>> are two ways I know this can be done.
>> You can modify the live-migration mechanism in Xen to save a
>> checkpoint instead of migrating to another host.  I don't know why
>> this hasn't been provided in the xm save tool, but it's a pretty
>> simple hack to get working since the xm migrate and xm save codebase
>> is basically the same.  If you're interested, I can send patches to
>> allow you to do that.  Then basically on a checkpoint, pre-copying
>> would be used to cut the actual time the domU has to be paused.
>> The other way that I've implemented for my research project is to use
>> copy-on-write.  I've implemented a prototype and in the middle of
>> writing paper for publication.  It's not suited for production use,
>> but I'd be glad to contribute the code if there's interest.
>> Mike
>> _______________________________________________
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