International Business Machines Corporation

Other

Brent Cameron Beardsley

Michael T Benhase

Lokesh M Gupta

Sonny Earl Williams

Robert Louis Morton

Harry M Yudenfriend

Binny Sher Gill

Douglas A Martin

Kenneth Wayne Todd

William Frank Micka

Susan Kay Candelaria

Joseph S Hyde, Ii

James Lincoln Iskiyan

Gail Andrea Spear

Michael Howard Hartung

Thomas Charles Jarvis

Forrest Lee Wade

Michael Aloysius Paulsen

Joel H Cord

Matthew J Kalos

Carl Evan Jones

Adalberto Guillermo Yanes

Lawrence Carter Blount

Joseph C Elliott

Juan Antonio Yanes

Mark Albert Reid

Keith Anthony Bello

Donald M Nordahl

Joseph Smith Hyde

Kevin J Ash

Gregory E McBride

Gregg Steven Lucas

William J Rooney

Catherine C Huang

Robert Francis Bartfai

Gary William Batchelor

Allan Samuel Meritt

David Frank Mannenbach

Vernon John Legvold

Minh-Ngoc Le Huynh

Jeffrey Allen Berger

Lloyd R Shipman, Jr

Richard Alan Schaeffer

William Dennis Williams

Vern J Legvold

Satish Chandra Penmetsa

Robert H Vosacek

Kaukab Uddin

Allen Charles Brailey

Peter L Leung

Ronald Robert Knowlden

Kathryn J Ayres

Susan Marie Wethington

John R Wolfe

Cortland D Starrett

Roger Gregory Hathorn

John R Flanagan

Andrew Dale Walls

Giles R Frazier

Daniel Francis Casper

Prasenjit Sarkar

David Harold Surman

Kenneth Fairclough Day, Iii

Louis William Ricci

John Richard Paveza

Bret Wayne Holley

Yoram Novick

Eugene P Hefferon

John Norbert McCauley

Shanker Singh

William Griswold Sherman

Robert Wesley Shomler

Chan Y Ng

Carol Spanel

Cuong Minh Le

Jimmy Paul Strickland

Gary Eugene Morain

Robert Earl Medlin

Paul Hodges

Michael Joseph Azevedo

Steven Robert Lowe

John Thomas Flynn, Jr

David L Leigh

Kenneth R Lynch

Joe-Ming Cheng

Paul W Hunter

Bitwoded Okbay

Jack Harvey Derenburger

Bradley S Powers

William G Sherman, Ii

Carol Santich Michod

James Elkins McIlvain

Russell Lee Ellison

Marc Ethan Goldfeder

Malcolm C Easton

Joe Edward Smothers

Belayneh Tafesse

Dell Patrick Leabo

John H Howard

Florence J Clark

Storage tracks from at least one host are destaged from the write cache rank when it is determined that the at least one host is idle with respect to a first set of ranks, and storage tracks are refrained from being destaged from each rank when it is determined that the at least one host is not idle with respect to a second set of ranks.

Systems and methods for background destaging storage tracks

Storage tracks from at least one server are destaged from the write cache rank when it is determined that the at least one server is idle with respect to a first set of ranks, and storage tracks are refrained from being destaged from each rank when it is determined that the at least one server is not idle with respect to a second set of ranks such that storage tracks in the first set of ranks may be destaged while storage tracks in the second set of ranks are not being destaged.

Storage tracks from at least one host are destaged from the write cache rank when it is determined that the at least one host is idle with respect to a first set of ranks, and storage tracks are refrained from being destaged from each rank when it is determined that the at least one host is not idle with respect to a second set of ranks such that storage tracks in the first set of ranks may be destaged while storage tracks in the second set of ranks are not being destaged.

A system includes a cache and a processor coupled to the cache. The cache stores data in multiple storage tracks and each storage track includes an associated multi-bit counter. The processor is configured to perform the following method. One method includes incrementing the multi-bit counter on each respective storage track a predetermined amount each time the processor writes to a respective storage track. The method further includes decrementing each multi-bit counter each scan cycle, and destaging each storage track including a zero count.

Systems and methods for destaging storage tracks from cache

Storage tracks are destaged from the write cache if the host(s) is/are idle and are not destaged from the write cache if one or more of the hosts is/are not idle. The storage tracks are refrained from being destaged from the write cache if the at least one host is not idle. Each rank is monitored for write operations from the at least one host, and a determination is made if the at least one host is idle with respect to each respective rank based on monitoring each rank for write operations from the at least one host such that the at least one host may be determined to be idle with respect to a first rank and not idle with respect to a second rank.

Destaging storage tracks from each rank that includes a greater than a predetermined percentage of a predetermined amount of storage space with respect to a current amount of storage space allocated to each rank until the current amount of storage space used by each respective rank is equal to the predetermined percentage of the predetermined amount of storage space. The destage storage tracks are declined from being destaged from each rank that includes less than or equal to the predetermined percentage of the predetermined amount of storage space rank.

Systems and methods for managing destage conflicts

A system includes a cache and a processor coupled to the cache. The cache stores data in multiple storage tracks and each storage track includes an associated multi-bit counter. The processor is configured to perform the following method. One method includes writing data to the plurality of storage tracks and incrementing the multi-bit counter on each respective storage track a predetermined amount each time the processor writes to a respective storage track. The method further includes scan each of the storage tracks in each of multiple scan cycles, decrementing each multi-bit counter each scan cycle, and destaging each storage track including a zero count. Also provided are physical computer storage mediums including a computer program product for performing the above method.

A system includes a cache partitioned into multiple ranks configured to store multiple storage tracks and a processor coupled to the cache. The processor is configured to perform the following method. One method includes allocating an amount of storage space in the cache to each rank and monitoring a current amount of storage space used by each rank with respect to the amount of storage space allocated to each respective rank. The method further includes destaging storage tracks from each rank until the current amount of storage space used by each respective rank is equal to a predetermined minimum amount of storage space with respect to the amount of storage space allocated to each rank. Also provided are physical computer storage mediums including code that, when executed by a processor, cause the processor to perform the above method.

A system includes a write cache configured to store a plurality of storage tracks and configured to be coupled to one or more hosts, and a processor coupled to the write cache. The processor includes code that, when executed by the processor, causes the processor to perform the method below. One method includes monitoring the write cache for write operations from the host(s) and determining if the host(s) is/are idle based on monitoring the write cache for write operations from the host(s). The storage tracks are destaged from the write cache if the host(s) is/are idle and are not destaged from the write cache if one or more of the hosts is/are not idle. Also provided are physical computer storage mediums including a computer program product for performing the above method.

A system includes a cache and a processor. The processor is configured to utilize a first thread to continually determine a desired scan time for scanning the plurality of storage tracks in the cache and utilize a second thread to continually control an actual scan time of the plurality of storage tracks in the cache based on the continually determined desired scan time. One method includes utilizing a first thread to continually determine a desired scan time for scanning the plurality of storage tracks in the cache and utilizing a second thread to continually control an actual scan time of the plurality of storage tracks in the cache based on the continually determined desired scan time.

Systems and methods for managing cache destage scan times

A system includes a cache partitioned into multiple ranks configured to store multiple storage tracks and a processor coupled to the cache. The processor is configured to perform the following method. One method includes allocating an amount of storage space in the cache to each rank and monitoring a current amount of storage space used by each rank with respect to the amount of storage space allocated to each respective rank. The method further includes destaging storage tracks from each rank until the current amount of storage space used by each respective rank is equal to a predetermined minimum amount of storage space with respect to the amount of storage space allocated to each rank.

A system includes a write cache configured to store a plurality of storage tracks and configured to be coupled to one or more hosts, and a processor coupled to the write cache. The processor includes code that, when executed by the processor, causes the processor to perform the method below. One method includes monitoring the write cache for write operations from the host(s) and determining if the host(s) is/are idle based on monitoring the write cache for write operations from the host(s). The storage tracks are destaged from the write cache if the host(s) is/are idle and are not destaged from the write cache if one or more of the hosts is/are not idle.

Write caching for sequential tracks is performed by a processor device in a computing storage environment for destaging data from nonvolatile storage (NVS) to a storage unit. If a first track is determined to be sequential, and an earlier track is also determined to be sequential, a temporal bit associated with the earlier track is cleared to allow for destage of data of the earlier track. If a temporal bit for one of a plurality of additional tracks in one of a plurality of strides in a modified cache is determined to be not set, a stride associated with the one of the plurality of additional tracks is selected for a destage operation. If the NVS exceeds a predetermined storage threshold, a predetermined one of the plurality of strides is selected for the destage operation.

Intelligent write caching for sequential tracks

A system includes a cache and a processor coupled to the cache. The cache stores data in multiple storage tracks and each storage track includes an associated multi-bit counter. The processor is configured to perform the following method. One method includes writing data to the plurality of storage tracks and incrementing the multi-bit counter on each respective storage track a predetermined amount each time the processor writes to a respective storage track. The method further includes scan each of the storage tracks in each of multiple scan cycles, decrementing each multi-bit counter each scan cycle, and destaging each storage track including a zero count.

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Tucson, AZ, United States of America

Brent Cameron Beardsley