Abstract: A method, system, computer system, and computer-readable medium to maintain consistent, up-to-date copies of primary data that enable quick resumption of operations upon failure of the primary node, the secondary node, and/or the network connecting nodes. The current status of individual storage locations is tracked, indicating whether data in each individual storage location is synchronized between a primary node and a secondary node. Transaction logging by a transaction-logging application, such as a file system or database system, is used to track individual storage locations updated with each transaction. Acknowledgements of these updates are tracked during replication to determine whether individual storage locations containing primary and secondary data are synchronized.

Abstract: A method, system, and computer program product are provided to synchronize data maintained in separate storage areas using a copy-on-read technique. The separate storage areas may be distributed across a network, and the replicas of the data may be used for backup and/or disaster recovery purposes. Storage objects containing data and information relevant to managing the data by a particular application are identified, and only those storage objects are read. Data contained in the storage objects read are then copied to the replica storage area. This process avoids reading non-useful data, making the synchronization more efficient and conserving bandwidth of connections over which the data are sent.

Abstract: A method, system, computer system, and computer-readable medium to maintain consistent, up-to-date copies of primary data that enable quick resumption of operations upon failure of the primary node, the secondary node, and/or the network connecting nodes. The current status of individual storage locations is tracked, indicating whether data in each individual storage location is synchronized between a primary node and a secondary node. Transaction logging by a transaction-logging application, such as a file system or database system, is used to track individual storage locations updated with each transaction. Acknowledgements of these updates are tracked during replication to determine whether individual storage locations containing primary and secondary data are synchronized.

Abstract: A method, system, and computer program product are provided to synchronize data maintained in separate storage areas using a copy-on-read technique. The separate storage areas may be distributed across a network, and the replicas of the data may be used for backup and/or disaster recovery purposes. Storage objects containing data and information relevant to managing the data by a particular application are identified, and only those storage objects are read. Data contained in the storage objects read are then copied to the replica storage area. This process avoids reading non-useful data, making the synchronization more efficient and conserving bandwidth of connections over which the data are sent.