Re: [Xen-devel] Virtualization project idea

[Michal Novotny <minovotn@xxxxxxxxxx>]

On 08/27/2010 03:22 PM, Pasi Kärkkäinen wrote:
> On Fri, Aug 27, 2010 at 03:18:01PM +0200, Christoph Egger wrote:
>    
> > On Friday 27 August 2010 15:08:47 Pasi Kärkkäinen wrote:
> >      
> > > On Fri, Aug 27, 2010 at 06:33:35PM +0530, Dhananjay Goel wrote:
> > >        
> > > >     Yes, exactly. So, we wanted to know if it is possible to *share USB*
> > > >     across VMs.
> > > >          
> > > I don't think USB protocol has been designed for *sharing*.
> > > I'm pretty certain only one computer/device/VM can use USB device at a
> > > time.
> > >        
> > This might work with firewire devices, I'm not sure.
> >
> >      
> Yeah, firewire (iee1394) is designed to so that you can attach
> the devices to multiple computers..
>
> If you attach the same firewire-disk to multiple computers,
> and use the disk from multiple computers at the same time,
> you *will* corrupt the filesystem on the disk.
>
> Unless you run some kind of filesystem that has lock-manager,
> that can coordinate the shared access to the disk..
> ie. you must be running cluster-aware filesystem.
>
> -- Pasi
>
>    
Well guys, but we're talking about USB. The USB protocol is different 
from firewire one. But that's right that I didn't know that. How is it 
exactly done with the firewire to connect to multiple computers?
Michal

--
Michal Novotny<minovotn@xxxxxxxxxx>, RHCE
Virtualization Team (xen userspace), Red Hat


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