Efficient Snapshot Mechanisms for Xen Virtual Machines

摘要

This paper presents an efficient new snapshot mechanism, briefed as Live Save, to make real time backup of the VM state to the local host. The proposed Live Save will iteratively send the state data, store the snapshot file in the local host and send the entire file directly to a remote host when necessary - to save significant bandwidth consumption. We also set up an advanced Improved Live Save which uses a simple judging device to handle the dirty frequency problem in Live Save. Simulation results show that, in contrast to other mechanisms, ours are able to conserve substantial network resources in performing snapshots.