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

[Quintin Russ <quintin@xxxxxxxxxxxxx>]

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,

Quintin

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 2.6.12.6-xen #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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