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

[Joe Warren-Meeks <joe.warren-meeks@xxxxxxxxxxxxx>]

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)
I get the error: "Error: Device 2049 (vbd) could not be connected.  
Backend device not found.
"

Now, I tracked it initially to being that Domain0 doesn't have /dev/ 
sda*, which the client domains are using as root, so I used MAKEDEV  
to create the device nodes and had some success.
However, if I halt/reboot/shutdown the client domain, the error  
returns if I try to restart it, even though the devices are in  
Domain0's /dev/
Also, if I reboot the whole machine, sometimes the client domains  
will start and some times they won't. Again, if they do, I can't  
restart them without that error occurring.
I get a lot of errors like the following in /var/log/xen-hotplug.log

"
xenstore-read: xenstore-read: couldn't read path backend/vbd/1/2049/node
couldn't read path backend/vbd/1/2050/node
xenstore-read: couldn't read path backend/vbd/2/2049/node
xenstore-read: couldn't read path backend/vbd/2/2050/node
xenstore-read: couldn't read path backend/vbd/3/2050/node
"

My /etc/xen/server.cfg:

kernel = "/boot/xen-linux-2.6.12.6-xen"
memory = 128
name   = "squid1"
root   = "/dev/sda1 ro"
vif    = [""]
disk   = [ 'file:/xen/domains/squid1/disk.img,sda1,w', 'file:/xen/ 
domains/squid1/swap.img,sda2,w' ]
dhcp = "dhcp"

Any ideas chaps?

Thanks!

 -- 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



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