International Business Machines Corporation

Michael Howard Hartung

Yu-Cheng Hsu

James T Brady

Damon W Finney

Jaishankar Moothedath Menon

Michael Anthony Ko

David R Nowlen

Michael T Benhase

Brent Cameron Beardsley

William Frank Micka

Glenn Rowan Wightwick

Karl Allen Nielsen

William Joseph Armstrong

Oded Cohn

Donald J Lang

Gerald E Tayler

Jeremy Michael Pinson

Kenneth M Nagin

Noah R Mendelsohn

David G Reed

Arthur H Nolta

Joel H Cord

Carl Evan Jones

Susan Kay Candelaria

Thomas Charles Jarvis

Yoram Novick

Vernon John Legvold

John Norbert McCauley

Claus William Mikkelsen

Steven Robert Lowe

Alexander Winokur

Richard E Rieck

Andrew Dale Walls

John H Christian

Alan H Duke

John N McCauley, Jr

Frederick J Marschner

Kenneth P Nolan

Kenneth Fairclough Day, Iii

Joseph S Hyde, Ii

Robert Frederic Kern

Lawrence Carter Blount

Efraim Zeidner

Brian B Moore

Robert Wesley Shomler

Mark Albert Reid

Paul Hodges

Kenneth R Lynch

William Garrett Verdoorn, Jr

Paul W Hunter

Richard Francis Freitas

Carl Zeitler, Jr

Roger L Cormier

William G Sherman, Ii

Carol Santich Michod

Howard Loomis Page

Narasimhareddy L Annapareddy

Joseph Smith Hyde

Marc Ethan Goldfeder

Malcolm C Easton

Robert H Vosacek

John S Williams

David H Wansor

John L Burk

Ray A Larner

Calvin Kuo-Lee Tang

John H Howard

Shin-Yuan Tzou

Kenneth Wayne Lane

Dennis Albert Kukula

William Lee Richardson

Narasimha Lakshmi Annapareddy

Arlon L Bastian

William G Verdoom, Jr

Jai M Menon

Donald J Lucas

John S William

Michael D Canon

Nimrod Rotics

Paul L Leung

Bruce M Henry

Steven T Broadbent

Guy Eugene Martin

A first logical partition in a first processing complex of a server cluster is operated in an active mode and a second logical partition in the processing complex is operated in a standby mode. Upon detection of a failure in a second processing complex of the server cluster. the standby mode logical partition in the first processing complex is activated to an active mode. In one embodiment, partition resources are transferred from an active mode logical partition to the logical partition activated from standby mode. Other embodiments are described and claimed.

Cluster availability management

An apparatus and program storage device for maintaining data is provided that includes receiving primary data at a first node, receiving mirrored data from a second and third node at the first node, and mirroring data received at the first node to a second and third node.

Apparatus and program storage device for providing triad copy of storage data

Provided are a method, system, and program for destaging a track from cache to a storage device. The destaged track is retained in the cache. Verification is made of whether the storage device successfully completed writing data. Indication is made of destaged tracks eligible for removal from the cache that were destaged before the storage device is verified in response to verifying that the storage device is successfully completing the writing of data.

Demoting tracks from cache

System and program for demoting tracks from cache

A first logical partition in a first processing complex of a server cluster is operated at a first level of a software code. Software code in a second logical partition in the same processing complex is changed to a second level. Processing operations are transferred from the first logical partition in the first processing complex to a third logical partition in a second processing complex of the server cluster. In another aspect, the transferring of processing operations includes quiescing the first logical partition to cause a failover of processing operations from the first logical partition in the first processing complex, to the third logical partition in the second processing complex. In yet another aspect, a failback operation is performed and a first portion of the processing operations are transferred from the third logical partition in the second processing complex, to the second logical partition in the first processing complex. In still another aspect, a second portion of the processing operations may be transferred from the third logical partition in the second processing complex, to the second logical partition in the first processing complex of the server cluster. In one example, the transferring of the second portion of processing operations includes quiescing the third logical partition to cause a failover of processing operations from the third logical partition in the second processing complex, to the second logical partition in the first processing complex. Other embodiments are described and claimed.

Cluster code management

Provided are a method, system and article of manufacture, wherein a request to access data is received from a requestor. A determination is made as to whether the requestor is authorized to access the data. In response to determining that the requestor is authorized to access the data, a determination is made as to whether the data is encrypted. An encryption key is requested from the requester, in response to determining that the data is not encrypted.

Encryption of data in storage systems

A first logical partition in a first processing complex of a server cluster is operated at a first level of a software code. Software code in a second logical partition in the same processing complex is updated to a second level. Processing operations are assumed by the second logical partition operating at the second level of software code. Other embodiments are described and claimed.

Dynamic cluster code updating in logical partitions

A method for maintaining data is provided that includes receiving primary data at a first node, receiving mirrored data from a second and third node at the first node, and mirroring data received at the first node to a second and third node.

Method for providing a triad copy of storage data

An apparatus and method to check integrity when handling data. The method provides a storage array which includes a plurality of sectors. The method defines (N) data state identifiers and (N) parity state identifiers. The method receives a command to handle data, where that command designates a target sector. The method determines the data state identifier assigned to the target sector, determines the parity state identifier assigned to the target sector, and compares the data state identifier and the parity state identifier. If the method determines that the data state identifier and the parity state identifier are the same, the method performs the command to handle data. Alternatively, if the method determines that the data state identifier and the parity state identifier differ, the method generates an error message.

Apparatus and method to check data integrity when handling data

Method for demoting tracks from cache

A method and system are disclosed for enhanced efficiency of backup copying of designated datasets stored within a plurality of storage devices coupled to the data processing system via a storage subsystem control unit having subsystem memory therein. Application execution within the data processing system is temporarily suspended long enough to form a dataset logical-to-physical system address concordance to be utilized to administer copying of the designated dataset. Thereafter, application initiated updates to uncopied portions of the designated datasets are temporarily deferred until sidefiles of the affected portions of the designated datasets are written to subsystem memory. The updates are then written to the storage subsystem. Portions of the designated datasets are then accessed and copied from the storage subsystem on a scheduled or opportunistic basis utilizing selected data retrieval command sequences. A sidefile status query is appended to selected data retrieval command sequences and the presence of data within the subsystem memory is determined without the necessity of additional communications between the data processing system and the storage subsystem. The sidefiles are then accessed and copied. Copied portions of the designated datasets and sidefiles are then copied to alternate storage locations in a backup copy order defined by the address concordance.

Method and system for sidefile status polling in a time zero backup copy process

A converter system that allows a host system using a first interface to use a second storage using a second interface. The invention provides a method to allow an ECKD MVS DASD storage using an ESCON interface to be used by an open system using a SCSI-type interface without changes to the ESCON storage or the open storage interfaces. The method also permits the SCSI-type interfaced open system to be physically located greater than 25 meters from the ESCON storage system. The method involves mapping the SCSI-type interface data and commands into parameters used and understood by the ESCON storage. The invention may also be implemented to provide a digital data storage medium containing the method of the invention and a digital apparatus capable of executing the invention.

Apparatus and method for allowing existing ECKD MVS DASD using an ESCON interface to be used by an open storage using SCSI-type interface

Conflicts are resolved between competing nodes in a multi-node communications network. After a first node in the network requests an initiation of communications with a target node, the requesting node may simply initiate the requested communications with the target node if the target node is not busy. If the first node determines that the target node is busy, it proceeds to resolve the conflict. Namely, the first node repeats the process of waiting for a first delay then requesting initiation of communications with the target node. After each unsuccessful attempt, the first delay is successively increased. As an example, the delay may be increased exponentially, with a controlled randomness added. After a or more queued messages to other nodes. Following this, the first node performs another sequence to initiate communications with the target node, successively increasing the delay between unsuccessful attempts, as before. After a predetermined number of unsuccessful passes through the foregoing routine, the first node proceeds to take appropriate action, such as initiating an error recovery routine, sending the message via different hardware components, or issuing an error message.

Conflict resolution in multi-node communication network

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Tucson, AZ, United States of America

Michael Howard Hartung