On Thu, 27 Jan 2011, W. Michael Petullo wrote:

> When I try to use:
> disk     = [ 'file:/tmp/openwrt-x86-xen_domu-rootfs-ext2.img,xvda,r', ]
> I get:
> [No boot]
> Error: Device 51712 (vbd) could not be connected. Path closed or removed 
> during hotplug add: backend/vbd/13/51712 state: 1

I have finally got a domU to boot in this sort of situation, having found 
a few bugs in 4.1.0-rc2 on the way when trying to use pygrub as a 
bootloader. Note that you may have to use xl rather than xm because they 
are deprecating xm and xm may not have support for qemu block backends.

        Michael Young
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