Hi, have you tried to set dom0 memory to a fixed value? Perhaps the explanation in this bug could help: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=414040
The message "Error: Device 5696 (vbd) could not be connected. Backend device not found." can occur if the device is (still) in use. I've found this sometimes if a domU was not normally shutdown. Possible solutions: + kill processe(s) accessing this device + restart xend + if a block device has really a problem (io blocking) you have to reboot -- greetings eMHa
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