CrashUp/Recover From Nova Uncontrolled Operations

Objective:

Aims to implement recovery features for Nova's uncontrolled operations. Unontrolled operations are those operations by which the instances can not transition from start states to final states directly. It passes though one or more intermediate states. In fact these operations usually involve external resources as well such as file, volume, network or some other resources. Following operations comes under these category:

• rescue
• unrescue
• rebuild
• snapshot
• resize
• migrate
• backup
• restore
• shelve
• unshelve