Emc Corporation

Joseph B Shimkus

Philippe Armangau

Xiangping Chen

Miles Aram De Forest

Steven D Sardella

Mark K Ku

Brian K Bailey

Andrew P Kubicki

Darrin Haug

Joseph Perry

Keith A P Morrissette

A method is used in improving deduplication efficiency. Metadata of a data object is evaluated for determining write activity of the data object. Based on the write activity, deduplicating technique is applied to the data object.

Deduplication efficiency

In a system comprising a plurality of components, characteristic data is stored on programmable read-only-memories (PROMS) on each component. The PROMs are coupled together via a simple bus, and data is retrieved from the PROMs using the bus. The collection of data from the PROMs provides the component characteristic data, and a portion of the component characteristic data is stored in one or more persistent media devices in the system, creating a last known good copy. The persistent storage device could be any device that does not lose data in the event of a loss of power.

Method and apparatus for preserving data in a high-availability system preserving device characteristic data

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Framingham, MA, United States of America

Joseph B Shimkus