News Column

Patent Issued for Apparatus to Manage Efficient Data Migration between Tiers

July 29, 2014



By a News Reporter-Staff News Editor at Information Technology Newsweekly -- A patent by the inventors Baderdinni, Anant (Norcross, GA); Smith, Gerald E. (Boulder, CO); Ish, Mark (Sandy Springs, GA), filed on November 15, 2011, was published online on July 15, 2014, according to news reporting originating from Alexandria, Virginia, by VerticalNews correspondents.

Patent number 8782369 is assigned to LSI Corporation (San Jose, CA).

The following quote was obtained by the news editors from the background information supplied by the inventors: "In block based storage systems, overall system performance is improved by moving data that is frequently accessed (hot data) to faster and more capable drives and at the same time moving less frequently accessed data (cold data) to less capable slow storage. This solution, known as storage tiering, is more cost effective than using high performance storage for all storage needs. A typical tiering configuration will utilize a large storage pool of cheaper and less capable drives (e.g. SATA drives) as a 'slow tier' and a small pool of expensive and more capable drives (e.g. SSDs) as a 'fast tier'. Tiering provides superior performance per unit cost than other comparable configuration.

"For tiering to be effective, hot data must be maintained on the fast tier and cold data must be maintained on the slow tier even as the access frequency of data changes over time. A tiered data storage system tracks the access frequency of data or blocks of data and moves data between tiers as access frequencies change. The movement of data between tiers is an overhead that takes away bandwidth from actually servicing IOs.

"Consequently, it would be advantageous if an apparatus existed that is suitable for efficiently migrating data between tiers in a tiered data storage system."

In addition to the background information obtained for this patent, VerticalNews journalists also obtained the inventors' summary information for this patent: "Accordingly, the present invention is directed to a novel method and apparatus for efficiently migrating data between tiers in a tiered data storage system.

"One embodiment of the present invention is a data storage system having a fast tier and a slow tier where a portion of the fast tier is reserved. As previously cold data becomes hot, the data is transferred from the slow tier to the reserved portion of the fast tier. A table initially tracks all of the space in the reserved portion of the fast tier. As data becomes hot and is transferred to the reserved portion of the fast tier, the table is modified to add the previous location of the data on the slow tier to the reserve portion and remove the new location of the data on the fast tier from the reserve portion. By this method, data migration is predominantly from the slow tier to the fast tier without immediate corresponding migrations from the fast tier to the slow tier, thereby reducing the initial overhead of migration. When a certain percentage of the reserve portion has been migrated to the slow tier, the data storage system performs a mass migration of cold data from the fast tier to the slow tier. The timing of the mass migration may be dependent on available system resources.

"It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention claimed. The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate an embodiment of the invention and together with the general description, serve to explain the principles."

URL and more information on this patent, see: Baderdinni, Anant; Smith, Gerald E.; Ish, Mark. Apparatus to Manage Efficient Data Migration between Tiers. U.S. Patent Number 8782369, filed November 15, 2011, and published online on July 15, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=8782369.PN.&OS=PN/8782369RS=PN/8782369

Keywords for this news article include: Information Technology, Information and Data Migration, Information and Data Storage, LSI Corporation.

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Source: Information Technology Newsweekly


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