Länk - Remus - ett försök att få snabb kopiering/migrering av Xen-instanser

About Remus Remus provides transparent, comprehensive high availability to ordinary virtual machines running on the Xen virtual machine monitor. It does this by maintaining a completely up-to-date copy of a running VM on a backup server, which automatically activates if the primary server fails. Key features: * The backup VM is an exact copy of the primary VM. When failure happens, it continues running on the backup host as if failure had never occurred. * The backup is completely up-to-date. Even active TCP sessions are maintained without interruption. * Protection is transparent. Existing guests can be protected without modifying them in any way.

Läs mer: Remus

Remus optimizes checkpoint signaling in two ways: First, it reduces the number of inter-process requests required to suspend and resume the guest domain. Second, it entirely removes xenstore from the suspend/resume process. In the original code, when the migration process desired to suspend a VM it sent a message to xend, the VM management daemon.

Läs mer: Remus: High Availability via Asynchronous Virtual Machine Replication