xen_blk: Initialising virtual block device driver xen_blk: Timeout connecting to device! xen_net: Initialising virtual ethernet driver. md: md driver 0.90.1 MAX_MD_DEVS=256, MD_SB_DISKS=27 NET: Registered protocol family 2 IP: routing cache hash table of 256 buckets, 4Kbytes TCP established hash table entries: 4096 (order: 4, 65536 bytes) TCP bind hash table entries: 4096 (order: 4, 65536 bytes) TCP: Hash tables configured (established 4096 bind 4096) Initializing IPsec netlink socket NET: Registered protocol family 1 NET: Registered protocol family 17 md: Autodetecting RAID arrays. md: autorun ... md: ... autorun DONE. VFS: Cannot open root device "sda3" 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)