[Xen-users] RE: [Xen-devel] Error: Device 768 (vbd) could not be connected. Backend device not found.

["Zhao, Yunfeng" <yunfeng.zhao@xxxxxxxxx>]

It is because there is no free loop deivces.
Try to free some loop devices with executing the cmd "losetup -d /dev/loopX".

Thanks
Yunfeng


>-----Original Message-----
>From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
>[mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Jonathan M. McCune
>Sent: 2006年4月19日 22:12
>To: xen-users@xxxxxxxxxxxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx
>Subject: [Xen-devel] Error: Device 768 (vbd) could not be connected. Backend
>device not found.
>
>Hello,
>
>I am getting this error when I try to start an HVM guest on an AMD
>Sahara system.  The xen-unstable-hvm.hg revision 8724 works fine.  I
>tried to upgrade to xen-unstable.hg revision 9668.  I got 9668 to boot
>using 'yaird' to build the initrd for the -xen kernel. I can
>successfully start a paravirtualized guest, but I am now having trouble
>starting an HVM guest.  The error message is:
>
>Error: Device 768 (vbd) could not be connected. Backend device not found.
>
>I googled a bit and other people have seen this error, but no solutions
>seem to be presented.
>
>Each attempt to start the domain puts a line like the following in
>/var/log/xen-hotplug.log (The '8' here is the domain ID):
>
>xenstore-read: couldn't read path backend/vbd/8/768/node
>
>Here is my config file:
>
>kernel = "/usr/lib/xen/boot/hvmloader"
>builder='hvm'
>memory = 260
>name = "Sarge"
>disk = [ 'file:/sarge/disk.img,ioemu:hda,w' ]
>vif = [ 'type=ioemu, mac=00:14:bf:52:df:5e, bridge=xenbr0' ]
>device_model = '/usr/lib/xen/bin/qemu-dm'
>memmap = '/usr/lib/xen/boot/mem-map.sxp'
>boot='c'
>sdl=1
>vnc=0
>
>I have made sure that xend and xenstored are running, but I'm not sure
>what else to check (it works on the older Xen!).  Any suggestions would
>be greatly appreciated.
>
>Thanks,
>-Jon
>
>
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