Hewlett Packard Enterprise Development LP

Thomas Dings

Peter Madany

Architectures and mechanisms for rebuilding data on a node in a multimode system providing replicated data stores. A primary node provides a primary data store and a secondary node provides a replicated data store and replication to the second node occurs substantially synchronously during periods of normal operation for the second node. If the secondary node is available after a period of unavailability a copy of previously-replicated data on the secondary node is copied and stored when the secondary node is available after the period of unavailability before rebuilding of the secondary node to recover from the period of unavailability. The copy of the previously-replicated data can be used as a backup copy to the primary node during the rebuilding. The data on the secondary node is updated after the copy has been made. The updating comprises asynchronously writing data to the data on the secondary node. The secondary node synchronously replicates data from the primary node after the rebuilding.

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Westborough, MA, United States of America

Thomas Dings