Methods and apparatus for deduplication in storage system

Details Methods and apparatus for deduplication in storage system Methods and apparatus for deduplication in storage system

2011-01-11

2011-01-11

Vo, Tim T. (Department: 2168)

Data processing: database and file management or data structures

Data integrity

Data cleansing, data scrubbing, and deleting duplicates

C707S814000

Reexamination Certificate

active

07870105

ABSTRACT:
In one implementation, a storage system comprises host computers, a management terminal and a storage system having block interface to communicate with the host computers/clients. The storage system also incorporates a deduplication capability using chunks (divided storage area). The storage system maintains a threshold (upper limit) with respect to the degree of deduplication (i.e. number of virtual data for one real data) specified by users or the management software. The storage system counts the number of links for each chunk and does not perform deduplication when the number of reduced data for a chunk exceeds the threshold, even if duplication is detected. In another implementation, the storage system additionally incorporates a data migration capability and migrates physical data to high reliability area such as area protected with double parity (i.e. RAID6) when the deduplication level for a chunk exceeds the threshold.

REFERENCES:
patent: 6233607 (2001-05-01), Taylor et al.
patent: 6704730 (2004-03-01), Moulton et al.
patent: 7065619 (2006-06-01), Zhu et al.
patent: 2006/0059207 (2006-03-01), Hirsch et al.
patent: 2007/0043734 (2007-02-01), Cannon et al.
A-Sis Deduplication Overview, Network appliance provides file storage system (NAS) using deduplication: http://www.netapp.com/products/storage-systems
ear-line-storage/asis-dedup.html.

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