Netapp, Inc.

Lsi Corporation

Eric Bonnell

William Hetrick

Theresa Lynn Segura

Eric Keighin

Arindam Banerjee

A system and method for managing distributed coherent datasets using a hierarchical change log is provided. In some embodiments, a distributed storage system is provided that includes a primary storage device containing a primary dataset and a mirror storage device containing a mirror dataset. The mirror dataset includes a coherent copy of the primary dataset. The distributed storage system further includes a hierarchical change log tracking a coherence state for the mirror dataset. The hierarchical change log includes a first sub-log and a second sub-log, and a block range of the first sub-log overlaps a block range of the second sub-log. The hierarchical change log may define a priority relationship between the first sub-log and the second sub-log governing the overlap. The first sub-log and the second sub-log may be independently configured and may be different in one of a representation and a block size.

Hierarchical coherency log for managing a distributed data storage system

Disclosed is a system and method that resolves a mismatch between software versions executing on redundant controllers. A mismatch between a first software version executing on a first redundant controller and a second software version executing on a second redundant controller is identified. By comparing software version identifiers associated with the first software version, the second software version, and a stored system software identifier, a preferred software version is selected. The preferred software version is copied from a controller running the preferred software version to the other controllers.

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Boulder, CO, United States of America

Eric Bonnell