From mboxrd@z Thu Jan  1 00:00:00 1970
From: Michal Novotny <minovotn@redhat.com>
Subject: Re: Virtualization project idea
Date: Fri, 27 Aug 2010 15:26:46 +0200
Message-ID: <4C77BD16.2030900@redhat.com>
References: <20100827084622.GA2804@reaktio.net>	<AANLkTikke8p3+m9C_npP87VVJA5czya2ie-xyFNC5pgx@mail.gmail.com>	<20100827130847.GG2804@reaktio.net>	<201008271518.01980.Christoph.Egger@amd.com>
	<20100827132223.GH2804@reaktio.net>
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To: =?ISO-8859-1?Q?Pasi_K=E4rkk=E4inen?= <pasik@iki.fi>
Cc: Christoph Egger <Christoph.Egger@amd.com>, xen-devel@lists.xensource.com, Dhananjay Goel <dhananjaygoel123@gmail.com>, James Harper <james.harper@bendigoit.com.au>
List-Id: xen-devel@lists.xenproject.org

On 08/27/2010 03:22 PM, Pasi K=E4rkk=E4inen wrote:
> On Fri, Aug 27, 2010 at 03:18:01PM +0200, Christoph Egger wrote:
>   =20
>> On Friday 27 August 2010 15:08:47 Pasi K=E4rkk=E4inen wrote:
>>     =20
>>> On Fri, Aug 27, 2010 at 06:33:35PM +0530, Dhananjay Goel wrote:
>>>       =20
>>>>     Yes, exactly. So, we wanted to know if it is possible to *share =
USB*
>>>>     across VMs.
>>>>         =20
>>> 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.
>>>       =20
>> This might work with firewire devices, I'm not sure.
>>
>>     =20
> 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
>
>   =20
Well guys, but we're talking about USB. The USB protocol is different=20
from firewire one. But that's right that I didn't know that. How is it=20
exactly done with the firewire to connect to multiple computers?

Michal

--=20
Michal Novotny<minovotn@redhat.com>, RHCE
Virtualization Team (xen userspace), Red Hat