VMware, Inc.
Method to perform crash and failure recovery for a virtualized checkpoint protected storage system

Abstract:

A method for recovering content stored in virtual machines is provided. This method includes isolating a data object to be recovered from a crash or error from incoming and outstanding processes; backing out uncommitted changes of the data object based on undo logs; determining a most recent checkpoint for the data object; reinitializing the data object from the most recent checkpoint to produce a reinitialized data object; and populating the reinitialized data object to produce a recovered data object by replaying, from a write-ahead log.