Generating Snapshot Backups in Cloud Virtual Disks

This paper presents a new snapshot backup approach to solve the snapshot damage problem in snapshot rollback. The new approach adopts a fixed number of XOR operations to generate additional snapshot backups, uses the generated extra backups to repair damaged snapshots, and as a result maintains desirable system performance. Simulation results show that, when compared with previous snapshot approaches, our approach consumes only slightly more system resources -- due to involving the XOR operations, but is able to achieve more desirable snapshot rollback and overall system performance because the generated extra backups bring up the degrees of file recovery.