Recovering Virtual Machine from Failure of Post-Copy Live Migration
New approach to recover a Virtual Machine during post-copy live migration
Post-copy is one of the two key techniques (besides pre-copy) for live migration of virtual machines in data centers. Post-copy provides deterministic total migration time and low downtime for write-intensive VMs. However, if post-copy migration fails for any reason, the migrating VM is lost because the VM’s latest consistent state is split between the source and destination nodes during migration.
PostCopyFT, a new approach to recover a VM after a destination or network failure during post-copy live migration, using an efficient reverse incremental checkpointing mechanism. We have implemented and evaluated our approach in the KVM/QEMU virtualization platform.
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Our experimental results show that the total migration time of post-copy remains unchanged while maintaining low recovery time, downtime, and application performance overhead.
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