By checkpointing and restoring a user application process, that includes a volatile state and a persistent state, recovery of an application process from the checkpoint position is possible. Specifically, a volatile state is checkpointed in a checkpoint position. Next, the persistent state is monitored...http://www.google.fr/patents/US6105148?utm_source=gb-gplus-shareBrevet US6105148 - Persistent state checkpoint and restoration systems
Persistent state checkpoint and restoration systems