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Re: [Xen-devel] Virtualization project idea

To: Dhananjay Goel <dhananjaygoel123@xxxxxxxxx>
Subject: Re: [Xen-devel] Virtualization project idea
From: Michal Novotny <minovotn@xxxxxxxxxx>
Date: Fri, 27 Aug 2010 16:20:53 +0200
Cc: James Harper <james.harper@xxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx
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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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