Qcow also does not currently work with the GPLPV drivers that James is
working on - seems the HVM domUs (in Xen 3.2) don't pass on drive
geometry figures for any tap-based drives.
-Nick
-----Original Message-----
From: Fabian Flägel <fabigant@googlemail.com>
To: Mike Sun <msun@gatech.edu>
Cc: Nick Couchman <Nick.Couchman@seakr.com>, XEN Mailing List
<xen-users@lists.xensource.com>, xen-research@lists.xensource.com
Subject: Re: [Xen-users] xm save -c
Date: Fri, 14 Nov 2008 18:51:08 +0100
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.
Regards,
Fabian
2008/11/14 Mike Sun <msun@gatech.edu>
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.
Thanks,
Mike
On Fri, Nov 14, 2008 at 4:42 AM, Fabian Flägel
<fabigant@googlemail.com> wrote:
> Hi Mike,
>
> i'd like to see your code. :)
>
> Regards
> Fabian
>
> 2008/11/14 Mike Sun <msun@gatech.edu>
>>
>> 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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>> http://lists.xensource.com/xen-users
>
>
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