Re: [Xen-devel] Virtualization project idea

[Michal Novotny <minovotn@xxxxxxxxxx>]

On 08/27/2010 04:00 PM, Dhananjay Goel wrote:
> Yeah, I think so. I think this is basically the USB over IP interface 
> which makes the impression of sharing and it even may be called 
> sharing but one device is being still physically connected to one 
> slot/device and not multiple at once.
> --Yes, exactly. It is just connected to one slot/device and not 
> multiple but this device should be accessible to each virtual machine? 
> As each virtual machine is sharing the same hardware. Please let me 
> know if it makes sense.
> Thanks,
> Dhananjay
Basically that's right. It makes sense Dhananjay because this is the USB 
over IP type of sharing. Imagine you have one device, let's say 
hard-drive connected to the USB and there's some kind of protocol to 
share it over the internet. It's more or less like let's say FTP server 
with the exception that we don't access the FTP server application but 
we access the USB hard-drive instead. It can accept all the command 
using e.g. the HTTP protocol and the commands may be done simultaneously 
when not conflicting with the other clients for which the perfect 
example is the read-only access. Since it's not conflicting with any 
other client every user/client could place a request on some file and 
the file is being retrieved using the USB-over-IP protocol and the data 
sent to the client that requested them. The virtual machines are sharing 
the same hardware so that's why I used comparison to HTTP/FTP server and 
it's clients. The logic is pretty similar AFAIK.
Michal

> On Fri, Aug 27, 2010 at 7:20 PM, Michal Novotny <minovotn@xxxxxxxxxx 
> <mailto:minovotn@xxxxxxxxxx>> wrote:
>     On 08/27/2010 03:34 PM, Pasi Kärkkäinen wrote:
>
>         On Fri, Aug 27, 2010 at 06:59:55PM +0530, Dhananjay Goel wrote:
>
>                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.
>                --Please check:*[1]http://spice-space.org/*They're
>             <http://spice-space.org/*They%27re> trying similar thing.
>
>
>         I think SPICE protocol allows you to *transport* (aka connect)
>         single
>         USB device to single desktop OS. It's not USB sharing.
>
>         It's basicly USB-over-IP.. replacing the physical USB cable
>         with IP connection.
>
>         -- Pasi
>
>
>     Yeah, I think so. I think this is basically the USB over IP
>     interface which makes the impression of sharing and it even may be
>     called sharing but one device is being still physically connected
>     to one slot/device and not multiple at once.
>
>
>     Michal
>
>     -- 
>     Michal Novotny<minovotn@xxxxxxxxxx <mailto:minovotn@xxxxxxxxxx>>, RHCE
>     Virtualization Team (xen userspace), Red Hat
>
>
>
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>    

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


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