Patent ID: 7249281
Filing Date: 2007-07-24
Classification: G06F

Abstract:
1. A computer-readable medium having computer executable instructions for performing steps for backing up and restoring a data set of a node in a distributed system, comprising: initiating a back up operation of an original data set, the original data set having state data indicating that the original data set is original data rather than backup data; before making a backup copy of the original data set, changing the state data of the original data set to indicate that the original data set is backup data after changing the state data of the original data set, taking a snapshot of the contents of the original data set, including the state data indicating that the original data set is backup data, to generate a backup copy, the contents of the original data set including a plurality of changes each identified by a replication identification number of the node and a serial number; and after taking the snapshot, resetting the state data of the original data set to again indicate that the original data set is original data rather than backup data.