I had to start a new Xen domU this afternoon,
xm create vm#.domain
But this resulted in following error:
Error: Device 5632 (vbd) could not be connected.
Failed to find an unused loop device
Solution:
Create /etc/modprobe.d/local-loop.conf
with this content:
options loop max_loop=64
Turn off all DomUs, yes, bummer. You’ll need to reload the loop module which won’t work if Xen is still using them. xm list
should only display Domain-0.
modprobe -r loop && modprobe loop
And restart all DomUs. You can now create 32 (64/2 ~= # of DomUs; increase if you need more) DomUs.
You can check (before & after) the difference in loop back devices: ls -ls /dev | grep loop | wc -l
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