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Re: [Xen-users] Error: Device 2049 (vbd) could not be connected. Backend device not found.

Hi Joe,

Good on ya for keeping it up mate. I have the same problem & have been hunting around for an answer. If I learn anything new I will post it here. Heres something random for ya:

On my server upgrading from 3.0.1 -> 3.0.2 means that this error shows up after i've booted 2 DomU's before it was showing up after i'd booted one. All I can say is weird.

Best Regards,


Joe Warren-Meeks wrote:

On 27 Apr 2006, at 14:43, Joe Warren-Meeks wrote:

Hey guys,

I've installed xen 3 and xen-tools on my ubuntu server and all seems well, until I try to start a client domain. (running on Linux xenserver #1 SMP Wed Feb 1 21:23:17 UTC 2006 i686 GNU/Linux)

Bit of a follow-up. If I try to start the DomU, it initally errors as so:

root@xenserver:/etc/xen# xm create -c squid1.cfg
Using config file "squid1.cfg".
Error: Device 2049 (vbd) could not be connected. Backend device not found.

and then shows up as paused in 'xm list'

If I then attach a console to it, then unpause I see the following error at the end:

VFS: Cannot open root device "sda1" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

I've tried adding /dev/ nodes using MAKEDEV in both the Dom0 and DomU and tried changing sda to hda, to no avail.

Anyone got a pointer to where I can start looking?

As a futher follow up, if I use xen-create-image to create a new domU, this completes fine and then starts the image successfully! I can then go and start all the other images and all is fine.

Once I've halted them all and rebooted the server itself, it all stops working again.

Anyone got any pointers? This is getting quite frustrating.

 -- joe.

Joe Warren-Meeks                       T: +44 (0) 208 962 0007
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