Xen users - Aug 2006 - Error: Device 2049 (vbd) could not be connected. Backend device not found.

Hi,

I''m sorry if this is already covered on the list but I
couldn''t find it.

Whenever I reboot my server and I would like to start an vm guest I get 
this error:

********:/home/sander# xm create -c /etc/xen/vm-config.sxp
Using config file "/etc/xen/vm-config.sxp".
Error: Device 2049 (vbd) could not be connected. Backend device not found.
********:/home/sander#

BUT the strange thing is when I do this:

mount -o loop /var/images/mineimage /mnt/bla
chroot /mnt/bla
umount /mnt/bla
exit

And then launch

********:/home/sander# xm create -c /etc/xen/vm-config.sxp

It works fine. I just need after every reboot to do the mount umount thing.

Anyone has a clue about why this is happening?

Kind regards,

Sander Naudts

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Hello,

you should make a 

modprobe loop 

or load the module on start


R. R.



Am Dienstag, 1. August 2006 11:26 schrieb Sander Naudts:
> Hi,
>
> I''m sorry if this is already covered on the list but I
couldn''t find it.
>
> Whenever I reboot my server and I would like to start an vm guest I get
> this error:
>
> ********:/home/sander# xm create -c /etc/xen/vm-config.sxp
> Using config file "/etc/xen/vm-config.sxp".
> Error: Device 2049 (vbd) could not be connected. Backend device not found.
> ********:/home/sander#
>
> BUT the strange thing is when I do this:
>
> mount -o loop /var/images/mineimage /mnt/bla
> chroot /mnt/bla
> umount /mnt/bla
> exit
>
> And then launch
>
> ********:/home/sander# xm create -c /etc/xen/vm-config.sxp
>
> It works fine. I just need after every reboot to do the mount umount thing.
>
> Anyone has a clue about why this is happening?
>
> Kind regards,
>
> Sander Naudts
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users

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Hello All,

  I just ran into this on Debian.  I think the ide setting is a false
lead.  I found that the underlying issue is that the "loop" module
does not get loaded by Debian at boot time.  Adding "loop" to
/etc/modules resolved the issue.  Whatever the distribution, the
solution seems to be to poke Linux in the appropriate manner during
boot to load the "loop" module or to load the loop module at xend
start-up.  Joe''s stanza below in /etc/init.d/xend should work work for
the latter.
 To me, at least, it looks like converting to ide emulation in one''s
image is not needed.

-Adam


On 28 Apr 2006, at 12:55, Joe Warren-Meeks wrote:

Hey guys,


    I read xen-create-image to see why it seemed to work if I used
that. Just by an aside I noticed that there is an option of use-ide

    So, I''ve set "use-ide = 1" in
/etc/xen-tools/xen-tools.conf and
recreated my images and it seems to work now.

    I figure that an IDE server has problems trying to run a SCSI domU


    I''m creating a bunch of domUs now and rebooting to see if they all
start ok. (I also had to up my loopback devices as indicated in
another post)

    Give it a shot and report back.

Just to confirm, changing use-ide = 1 and changing my /etc/init.d/ xend to read:

  start)
        modprobe loop max_loop=64
        cd /dev && /dev/MAKEDEV loop
        xend start
        await_daemons_up
        ;;

fixed my problems. I now have three domU''s working happily.

Good luck.

 -- joe.

Joe Warren-Meeks                       T: +44 (0) 208 962 0007
Aggregator Limited                     M: +44 (0) 7789 176078
Unit 62/63 Pall Mall Deposit           E: joe.warren-meeks@xxxxxxxxxxxxx
124-128 Barlby Road, London W10 6BL
PGP Fingerprint: 361F 78D0 56F5 8D7F 2639  947D 71E2 8811 F825 64CC

--
-Adam


-- 
-Adam

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