International Business Machines Corporation

Other

The Gillette Company

Sanford Gmbh

Berol Corporation

Globalfoundries Inc.

John Glenn Thompson

David Michael Shackelford

Lisa Joan Gundy

Matthew J Kalos

Harry M Yudenfriend

Beth Ann Peterson

Carol Santich Mellgren

Warren Keith Stanley

Alfred Emilio Sanchez

Clint Alan Hardy

Nicolas Marc Clayton

Gail Andrea Spear

Scott Brady Compton

David B Petersen

Matthew Richard Craig

Lokesh M Gupta

David C Reed

Matthew G Borlick

David Darden Chambliss

James Alan Ruddy

Joshua W Knight

Ronald K Kreuzenstein

John J Lee

Peter Grimm Sutton

John Richard Paveza

Bret R Marschand

Lyn Lequam Ashton

Vliet M Hulse

Wilfred L Harris, Jr

Richard Anthony Ripberger

Robert Frederic Kern

Jean L Spencer

Roy Nicoll

Jose A Salinas

Wayne Erwin Rhoten

Alan George McClure

Anthony Steve Pearson

Charles Christopher Packham

Amar A Patel

Kim H Ng

John M Fritz

James B Cammarata

Crispin M Miller

Frank J Peterson

Paul Bryce Martin

Daniel Roman

Andrew R Klassman

Nan-Jae Lin

Michael Brandner

Michael Frankenberg

Matthew John Ward

Susan Kay Candelaria

William Earle Tucker

Joshua J Crawford

Norman D Poisson

Theodore Timothy Harris, Jr

Serge Bourbonnais

David Randall Blea

Paul Michael Cadarette

Michael G Fitzpatrick

Kirby Grant Dahman

Glenn Randle Wilcock

Ronald Maynard Kern

Rachel M Loftin

Richard J Kaiser

Mark Alan Haye

Jon Arthur Lynds

David Anthony Edgerley

William Thomas O'Connor

Gregory Walter Vance

Nicholas C Matsakis

Richard J Petrillo

Nan J Lin

Tri M Hoang

George W Korper

Nadim P Shehab

Eduard Aaron Diel

Norman G Sanborn

Kenneth Michael Kapulka

Michael Aloysius Paulsen

Jiandong Zhu

Thomas G Decker

Donald Reynold Blea

Marc Kenneth Duquette

Savur Anand Rao

Jeffrey Hautzinger

Chiou C Yau

Justin Paul Eastman

Henry Verdugo Valenzuela

Ming K Leung

Pamela McLean

Michelle Parks Dais, Legal Representative

Jason E Cantu

John D Galligan

Marc William Colavitti

Yufen Lin Davis

Josephine M Edwards, Legal Representative

Ricardo Urbanejo

David A Clitherow

Anand Rao Savur

Provided are a computer program product, system, and method verifying mirroring of source data units to target data units. Source data units in a source storage are mirrored to corresponding target data units in a target storage. The source data units are read to compare to corresponding mirrored target data units. The read source data units that did not match the corresponding target data units are saved in source version data. The source data units that were read and did not match the corresponding target data units are read. The mirroring of the source data units are verified in response to determining that for each mirrored source data unit, one of a read source data unit and the read source data unit saved in the source version data matches the corresponding target data unit.

Verifying mirroring of source data units to target data units

An umbrella-like scraper for cleaning tubes and pipes may include a scraper, an actuator and a hinge configured for selective deployment of the scraper by manipulation of the actuator.

Method and apparatus for cleaning a tube

Provided are a computer program product, system, and method for determining whether to destage write data in cache to storage based on whether the write data has malicious data. Write data for a storage is cached in a cache. A determination is made as to whether the write data in the cache comprises random data according to a randomness criteria. The write data in the cache to the storage in response to determining that the write data does not comprise random data according to the randomness criteria. The write data is processed as malicious data after determining that the write data comprises random data according to the randomness criteria.

Determining whether to destage write data in cache to storage based on whether the write data has malicious data

One general aspect of device reservation state synchronization in accordance with the present description, device reservation management logic ensures synchronization of reservation states of primary and secondary volumes of a mirror relationship in the event of a change in the state of the mirroring relationship such as achieving full data synchronization between the volumes. Other features and aspects may be realized, depending upon the particular application.

Device reservation state synchronization in data mirroring

Provided are a computer program product, system, and method for offloading processing of writes to determine malicious data from a first storage system to a second storage system. Write data for a first storage is cached in a first cache in the first storage system and copied to a second cache in the second storage system. The second storage system determines whether the copy of the write data comprises random data according to a randomness criteria. The second storage system returns a message to the first storage system indicating that the write data comprises malicious data if random or not malicious data if not random. The first storage system destages the write data in the first cache if the message indicates not malicious data or processes the write data in the first cache as malicious data if the message indicates malicious data.

Offloading processing of writes to determine malicious data from a first storage system to a second storage system

A method includes reading, by a capture engine, log data. The log data can be synchronously hardware-replicated. The log data reflects that an update was started for a database of a first site. The capture engine corresponds to a capture engine of a second site. The method also includes identifying, by the capture engine, the update. The method also includes determining whether the update was committed to the database of the first site. The method also includes replicating, by an apply engine, the update to a database of the second site based on the determining. The update is replicated to the database of the second site based on a determination that the update was committed to the database of the first site. The committed update corresponds to a consistent replication of updates across two or more databases that reside in multiple database management systems.

Ensuring consistent replication of updates in databases

Provided are a computer program product, system, and method for performing a failover between a first storage system and a second storage system. Data is synchronized between the first storage system and the second storage system. A failover is performed from the first storage system to the second storage system in response to a failover event at the first storage system while synchronizing the data. A determination is made that a first storage unit of the first storage system is inoperable and that that a second storage unit of the first storage system is operable in response to the failover event. In response to determining that the second storage unit is operable, a resynchronization is initiated to copy updates to a second storage unit of the second storage system mirroring the second storage unit of the first storage system to the second storage unit of the first storage system.

Resynchronizing to a first storage system after a failover to a second storage system mirroring the first storage system

One general aspect of device reservation state preservation in accordance with the present description, provides for an intermediate reservation state, referred to herein as a 'peer' reservation state, which may be maintained by a storage controller in the event of a total loss of communication connectivity to the reserving host so long as a peer or partner storage controller of a mirror relationship still has communication connectivity to the host. The peer reservation state as used herein, is a reservation state intermediate between a full reservation state for a device, and a fully released state in which a reservation of the device has been completely released. Other features and aspects may be realized, depending upon the particular application.

Device reservation state preservation in data mirroring

One general aspect of device reservation management in accordance with the present description, is directed to a host issuing I/O data requests to a primary device which synchronously mirrors data to a secondary data storage device wherein both devices are reserved for exclusive use by the host for I/O data requests. In response to a loss of communication connectivity on all paths to the primary storage controller controlling the primary device, the host confirms whether a communication path to the primary device has been established and whether the primary device remains reserved to the host. Upon successful confirmations, the reservation of the primary device is repaired such that I/O data requests to the reserved primary device continue. Other features and aspects may be realized, depending upon the particular application.

Device reservation management for overcoming communication path disruptions

Growing community of inventors

Tucson, AZ, United States of America

John Glenn Thompson