Re: [Xen-users] xm save -c

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

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@xxxxxxxxxxxxxx>
To: Mike Sun <msun@xxxxxxxxxx>
Cc: Nick Couchman <Nick.Couchman@xxxxxxxxx>, XEN Mailing List <xen-users@xxxxxxxxxxxxxxxxxxx>, xen-research@xxxxxxxxxxxxxxxxxxx
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@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.
>     
>     Thanks,
>     Mike
>     
>     
>     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
>     >>
>     >> _______________________________________________
>     >> Xen-users mailing list
>     >> Xen-users@xxxxxxxxxxxxxxxxxxx
>     >> http://lists.xensource.com/xen-users
>     >
>     >
>

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