Dev Tools · 1h ago
Post-Copy VM Migration: Faster Live Transfers via Demand Paging
Post-copy migration flips the pre-copy approach by first transferring CPU state to the target, then pushing memory pages while the VM runs. It uses demand paging, active push, prepaging, and dynamic self-ballooning to reduce downtime. This method is especially beneficial for write-intensive workloads where pre-copy suffers high latency.
Meridian48 take
The post-copy method promises lower downtime for write-heavy VMs, but its reliance on network page faults could introduce latency spikes in practice.
virtual-machine-migrationpost-copy-migration