I had been recieving boot error like this:
XENBUS: Device with no driver: device/vbd/51713 XENBUS: Device with no driver: device/vbd/51714 XENBUS: Device with no driver: device/vif/0
This was also causing the VMs to boot and run very slowly as the VM was not finding the blockfront.
The fix was simple, but google provided no answers, thus this post. After trial and error and creating a new VM using a Stacklet Template... I relaized the issue was in /boot/grub/grub.conf
The old grub.conf looked like this:
default=0 timeout=5 title CentOS (2.6.32-279.el6.x86_64) root (hd0,0) kernel /boot/vmlinuz-2.6.32-279.14.1.el6.x86_64 console=hvc0 xencons=tty0 root=/dev/xvda1 ro initrd /boot/initramfs-2.6.32-279.14.1.el6.x86_64.img title vmlinuz-2.6.32-279.el6.x86_64 root (hd0,0) kernel /boot/vmlinuz-2.6.32-279.el6.x86_64 console=hvc0 xencons=tty0 root=/dev/xvda1 ro initrd /boot/initramfs-2.6.32-279.el6.x86_64.img
The new like this:
default=0 timeout=5 title CentOS (2.6.32-279.14.1.el6.x86_64) root (hd0,0) kernel /boot/vmlinuz-2.6.32-279.14.1.el6.x86_64 console=hvc0 xencons=tty0 root=/dev/xvda1 ro crashkernel=auto LANG=C initrd /boot/initramfs-2.6.32-279.14.1.el6.x86_64.img title vmlinuz-2.6.32-279.el6.x86_64 root (hd0,0) kernel /boot/vmlinuz-2.6.32-279.el6.x86_64 console=hvc0 xencons=tty0 root=/dev/xvda1 ro initrd /boot/initramfs-2.6.32-279.el6.x86_64.img
Problem solved. I hope this helps someone out there as the info on google was somewhat spotty and esoteric.
Cheers.
