Hi, When I try to start a domU using tap aio, the system reported following error: XENBUS: Timeout connecting to device: device/vbd/769 (state 3) XENBUS: Timeout connecting to device: device/vbd/770 (state 3) XENBUS: Device with no driver: device/console/0 VFS: Cannot open root device "hda1" or unknown-block(0,0) Please append a correct "root=" boot option Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0) My domU config file is like: name = "vm1" kernel ="/usr/local/boot/vmlinuz-2.6.20-xenU-r2" root = "/dev/hda1" memory = "1024" #disk = [ ''file:/opt/vm1.img,hda1,w'',''file:/opt/vm1-swap.img,hda2,w'' ] disk = [ ''tap:aio:/opt/vm1.img,hda1,w'',''tap:aio:/opt/vm1-swap.img,hda2,w'' ] vif = [ ''bridge=xenbr0'' ] I am using Xen 3.1.0 with kernel 2.6.20 on gentoo. File based disk image works without any problem. Do I miss something in kernel or domU configuration? Simon _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users