Emc Corporation

Data Domain, Inc.

Allan J Bricker

Richard Johnsson

R Hugo Patterson

Greg Wade

Ming Benjamin Zhu

Kai Yi Li

Sazzala Reddy

Jeffery Zabarsky

Edward Kihyen Lee

A method for replicating a deduplicated storage system is disclosed. A stream of data is stored on an originator deduplicating system by storing a plurality of deduplicated segments and information on how to reconstruct the stream of data. The originator deduplicating system is replicated on a replica system by sending a copy of the plurality of deduplicated segments and information on how to reconstruct the stream of data to the replica system. A first portion of the deduplicated segments stored on the originator deduplicating system that is corrupted is identified. A copy of the first portion of the deduplicated segments is requested to be sent by the replica system to the originator deduplicating system.

Replication of deduplicated storage system

A method of replicating a deduplicated storage system is disclosed. The method comprises storing a stream of data on an originator deduplicating system by storing deduplicated segments and information on how to reconstruct the stream of data. The method further comprises replicating the originator deduplicating system by receiving a copy of the deduplicated segments, information regarding containers for the deduplicated segments, and information on how to reconstruct the stream of data transferred from the originator deduplicating system to the replica system.

A method of replicating a deduplicated storage system is disclosed. The method comprises requesting the state of a replica system. The method further comprises sending a container to the replica system and sending a file system log record to the replica system.

A network file system-based data storage system that converts random I/O requests into a piecewise sequential data structure to facilitate variable length data segment redundancy identification and elimination. For one embodiment of the invention a stateless network file system is employed. For one such embodiment, that provides multiple-client access to stored data, multiple Writes are buffered and then broken into variable length data segments. Redundant segment elimination is then effected. One embodiment of the invention allows sharing of the variable length data segments among files.

Network file system-based data storage system

A method for storing data is disclosed. The method comprises receiving a data stream comprising a plurality of data segments and preliminarily checking in a memory having a relatively low latency whether one of the plurality of data segments has been stored previously. The method further comprises in the event that the preliminary check does not conclusively determine whether the data segment has been stored previously, limiting checking in a memory having a relatively high latency to conclusively determine whether the data segment has been previously stored, and in the event that checking is limited or in the event that the check in the memory having relatively high latency conclusively determines the data segment has not been previously stored, storing the data segment.

Write latency efficient storage system

A method and apparatus for storing composite data streams. According to one embodiment of the invention, a composite data stream is stored so that it may be restored. The storing of the composite data stream includes decomposing the composite data stream into a plurality of constituent data streams, segmenting at least one of the plurality of constituent data streams, and discarding those of the segments resulting from the segmenting which are determined to have been stored previously.

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Sunnyvale, CA, United States of America

Allan J Bricker