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Re: [Xen-users] xm block-attach from dom0 and exception looking up devic

To: "trilok nuwal" <tc.nuwal@xxxxxxxxx>
Subject: Re: [Xen-users] xm block-attach from dom0 and exception looking up device number for /dev/xvda1 - why ?
From: "Ian Brown" <ianbrn@xxxxxxxxx>
Date: Fri, 13 Apr 2007 10:02:12 +0300
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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Hello,
I want to mounting an image in Dom0 using the blktap driver.
I of course can access the raw image, but I

There is **exactly** such an example in the blktap readme:

xm block-attach 0 tap:aio:<FILENAME> /dev/xvda1 w 0
mount /dev/xvda1 /mnt/disk        <--- don't use loop driver

see http://lxr.xensource.com/lxr/source/tools/blktap/README

So I don't understand what am I missing so it can work.

Regares,
Ian

On 4/13/07, trilok nuwal <tc.nuwal@xxxxxxxxx> wrote:


On 4/11/07, Ian Brown <ianbrn@xxxxxxxxx> wrote:
> Hello,
>
> I am trying to perform "xm block-attach" from dom0 according to the
> Xen blktap README.
>
> What I am trying to do is :
>
> xm block-attach 0
tap:aio:/var/lib/xen/images/guest2/guest2File /dev/xvda1 w
0

 I am doubtful if  this works to dom0, this should be used with other
domains. Why u need this device in dom0 . Everything is available to dom0.

> whereas "/var/lib/xen/images/guest2/guest2File" is the
image which appears
> in the domU cofig file:
> disk = [
'tap:aio:/var/lib/xen/images/guest2/guest2File,xvda,w',
...]
>
> I see the following error message in /var/log/xen/xend.log: (of dom0
> of course)
>
> [2007-04-11 10:51:24 xend 3123] DEBUG (blkif:24) exception
> looking up device number for /dev/xvda1:
> [Errno 2] No such file or directory: '/dev/xvda1'
>
> Indeed, ls -al /dev/xvda1 in dom0 gives:
>   ls: /dev/xvda1: No such file or directory
> and also  running "cat /proc/partitions |grep xvd" from dom0
> gives nothing.
>
>
> I want to add that tring mounting from dom0 onto domU succeeds:
> xm block-attach 1
tap:aio:/var/lib/xen/images/guest2/guest2File /dev/xvda1 w
> (where 1 is the number of domU).
> Also mounting /dev/xvda1 from domU succeeds.
>
> Any idea ? what should I do so that it will succeed ? is this readme
> not valid anynmore ??
>
>
> Ian
>
> _______________________________________________
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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>



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