== Checkpointing and live migration ==

A live migration and checkpointing feature was released for OpenVZ in the middle of April 2006. It allows to migrate a VE from one physical server to another without a need to shutdown/restart a VE. The process is known as checkpointing: a VE is freezed and its whole state is saved to the file on disk. This file can then be transferred to another machine and a VE can be unfreezed (restored) there. The delay is about a few seconds, and it is not a downtime, just a delay.