[Xen-bugs] [Bug 743] Unable to start more than a few domU's on RHEL4 amd64 (Error: Backend device not found)

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http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=743





------- Comment #13 from tejasvia@xxxxxxxxx  2006-08-28 21:37 -------
I compiled everything from scratch to make sure I got everything rurhg and then
re-started the VM's only to find they still fail to start with the same error
after the first few VM's start fine.

$ sudo xm list
Name                  D Mem(MiB) VCPUs State  Time(s)
Domain-0              0      869     1 r-----   456.7
vm1                   8       30     2 -b----     2.9
vm2                   9       30     2 -b----     3.0
vm3                  10       30     2 -b----     3.0
vm4                  11       30     2 -b----    13.1

$ sudo xm create -c vm5/*config
Using config file "vm5/vm5-config".
...
..
..
[ 1276.565042] XENBUS: Timeout connecting to device: device/vbd/769 (state 3)
[ 1276.565057] XENBUS: Timeout connecting to device: device/vbd/770 (state 3)
[ 1276.565065] XENBUS: Timeout connecting to device: device/vbd/771 (state 3)
[ 1276.565408] VFS: Cannot open root device "hda1" or unknown-block(0,0)
[ 1276.565418] Please append a correct "root=" boot option
[ 1276.565425] Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-bl

$ sudo xm create -c vm6/*config
##### similar error to  the previous one.

$ sudo xm create -c vm8/*config
Using config file "vm8/vm8-config".
Error: Device 0 (vif) could not be connected. Hotplug scripts not working.

$ sudo xm create -c vm9/*config
Using config file "vm9/vm9-config".
Error: Device 0 (vif) could not be connected. Hotplug scripts not working.

$ sudo xm create -c vm10/*config
Using config file "vm10/vm10-config".
Error: Device 0 (vif) could not be connected. Hotplug scripts not working

The weird thing is a few VM's fail with the kernel panic (because of the root
device not being available at that time in the boot sequence) while a few fail
because of "vif" problems (the second error above).


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