International Business Machines Corporation

Joseph S Hyde, Ii

Michael T Benhase

Lokesh M Gupta

Subhojit Roy

Bruce McNutt

Thomas Charles Jarvis

Brent Cameron Beardsley

Lee Charles LaFrese

Gail Andrea Spear

William Frank Micka

Sonny Earl Williams

Dharmendra S Modha

Aviad Zlotnick

Binny Sher Gill

Michael Edward Factor

Shachar Fienblit

Kevin J Ash

Susan Kay Candelaria

Yu-Cheng Hsu

Olympia Gluck

Juan Antonio Yanes

Martin Tross

Ronald J Venturi

Joel H Cord

Theodore Timothy Harris, Jr

Lawrence Yiumchee Chiu

Cheng-Chung Song

Paul Henri Muench

Vernon John Legvold

Robert Earl Medlin

Clement Lambert Dickey

M Amine Hajji

Amine M Hajji

William John Durica

Matthew J Kalos

Harry M Yudenfriend

Evangelos Stavros Eleftheriou

Roman Alexander Pletka

Beth Ann Peterson

David Darden Chambliss

Robert Haas

Warren Keith Stanley

Rui Zhang

Kenneth Wayne Todd

Yan Xu

Michael Howard Hartung

John Richard Paveza

Gary William Batchelor

David Frank Mannenbach

Alfred Emilio Sanchez

Prashant Pandey

William Griswold Sherman

Chung Man Fung

Chan Y Ng

Gary Eugene Morain

Xiaoyu Hu

Steven Robert Lowe

Richard Kenneth Martinez

Larry Richard Perry

Lloyd R Shipman, Jr

William G Sherman, Ii

Carol Santich Michod

Russell Lee Ellison

Donald Prentiss Terry

Thomas John Creath

For a cache in which a plurality of frequently accessed data segments are temporarily stored, reference count information of the plurality of data segments, in conjunction with least recently used (LRU) information, is used to determine a length of time to retain the plurality of data segments in the cache according to a predetermined weight, where notwithstanding the LRU information, those of the plurality of data segments having a higher reference counts are retained longer than those having lower reference counts.

Enhancing data caching performance

In a network computing environment, in which data stored at a primary storage system, is mirrored from the primary storage system to a secondary storage system, a selection may be made to direct an input/output operation such as a read operation, for example, to the secondary storage system instead of the primary storage system in order to improve operations. For example, a read operation may be directed to the secondary storage to improve the read operation response time. In other aspects, a read or other input/output operation may be directed to the secondary storage to improve utilization of the resources of the secondary storage system. Other aspects are described.

Input/output operation management in a device mirror relationship

An I/O enclosure module is provided with one or more I/O enclosures having a plurality of slots for receiving electronic devices. A host adapter is connected a first slot of the I/O enclosure module and is configured to connect a host to the I/O enclosure. A device adapter is connected to a second slot of the I/O enclosure module and is configured to connect a storage device to the I/O enclosure module. A flash cache is connected to a third slot of the I/O enclosure module and includes a flash-based memory configured to cache data associated with data requests handled through the I/O enclosure module. A primary processor complex manages data requests handled through the I/O enclosure module by communicating with the host adapter, device adapter, and flash cache to manage to the data requests.

Integrating a flash cache into large storage systems

A method for improving data storage and retrieval performance, comprising, for a tiered storage environment having levels corresponding to storage performance, using reference count information of at least one data segment maintained in the storage environment to determine which of the levels in the environment the data segment will be assigned; obtaining input/output performance data for input/output operations on the data segment and transforming the data into short term moving averages and long term moving averages; comparing the averages in a performance level to the long term moving averages of the data segment in the performance level and examining the reference count information over time to determine whether a performance trend of the data segment is increasing or decreasing; and promoting the data segment to a higher performance level in the tiered storage environment, if the data segment has an increasing performance trend.

Enhancing tiering storage performance

Various embodiments for improving hash index key lookup caching performance in a computing environment are provided. In one embodiment, for a cached fingerprint map having a plurality of entries corresponding to a plurality of data fingerprints, reference count information is used to determine a length of time to retain the plurality of entries in cache. Those of the plurality of entries having a higher reference counts are retained longer than those having lower reference counts.

Enhancing data processing performance by cache management of fingerprint index

A storage controller receives a request that corresponds to an access of a track. A determination is made as to whether the track corresponds to data stored in a solid state disk. Record staging to a cache from the solid state disk is performed, in response to determining that the track corresponds to data stored in the solid state disk, wherein each track is comprised of a plurality of records.

Adaptive record caching for solid state disks

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Tucson, AZ, United States of America

Joseph S Hyde, Ii