Migrating Storage
Live migration only copies the RAM and processor state; ensuring that the migrated domain can access its disk is up to the administrator. As such, the storage issue boils down to a question of capabilities. The migrated domain will expect its disks to be exactly consistent and to retain the same device names on the new machine as on the old machine. In most cases, that means the domU, to be capable of migration, must pull its backing storage over the network. Two popular ways to attain this in the Xen world are ATA over Ethernet (AoE), and iSCSI. We also discussed NFS in Chapter 4. Finally, you could just throw a suitcase of money at NetApp.
There are a lot of options beyond these; you may also want to consider cLVM (with some ...
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