Re: [Xen-devel] Dom0 restartability

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Apr 30, 2010 at 05:54:37PM +0100, Charlie Smurthwaite wrote:
>    Am I correct in believing that the majority of IO for all domains passes
>    through the DOM-0 kernel?
>

Yes, at the moment dom0 is usually taking care of all the disk/network IO for 
the guests,
aka disk and network backend drivers are in dom0.

> I would think that a huge number of IO drivers
>    would need to move into Xen in order to allow this without severe IO
>    disruption. Are there methods of disk / network IO that do not rely on
>    DOM-0?
> 

Yeah, you can use 'Driver domains', to have the disk/net backends in a separate 
guest.
I don't think it makes any sense to have disk/net drivers in Xen hypervisor.
It's much easier to run Linux dom0 or Driver Domain to serve the disk/net IO.

-- Pasi

>    Charlie
> 
>    On 30 April 2010 17:19, Subbiah Kandasamy (skandasa)
>    <[1]skandasa@xxxxxxxxx> wrote:
> 
>      Thanks Pasi, I am sure there are other things as well. I am looking for
>      any pointers listing the work done in that area.
> 
>      Thanks,
>      -SK.
>      -----Original Message-----
>      From: Pasi Kärkkäinen [mailto:[2]pasik@xxxxxx]
>      Sent: Thursday, April 29, 2010 5:34 PM
>      To: Subbiah Kandasamy (skandasa)
>      Cc: [3]xen-devel@xxxxxxxxxxxxxxxxxxx
>      Subject: Re: [Xen-devel] Dom0 restartability
> 
>      On Thu, Apr 29, 2010 at 04:05:13PM -0700, Subbiah Kandasamy (skandasa)
>      wrote:
>      >    In today's Xen summit I heard there is some work done on the
>      >    restartability of dom0. Any pointers to what has been done and what
>      is
>      >    pending and the patches ?.
>      >
> 
>      Restarting dom0 requires for example moving xenstored out of dom0..
>      so you don't lose the database when you restart dom0.
> 
>      -- Pasi
> 
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> References
> 
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