International Business Machines Corporation

Timothy James Larson

Robert Edward Galbraith

Adrian Cuenin Gerhard

William J Maitland, Jr

Evangelos Stavros Eleftheriou

Roman Alexander Pletka

Timothy J Schimke

Ioannis Koltsidas

Robert Haas

Brian Eric Bakke

Joseph R Edwards

Xiao-yu Hu

Murali N Iyer

Steven Paul Norgaard

Brian James King

A method for optimizing locations of physical data accessed by one or more client applications interacting with a storage system, with the storage system comprising at least two redundancy groups having physical memory spaces and data bands. Each of the data bands corresponds to physical data stored on several of the physical memory spaces. A virtualized logical address space includes client data addresses utilizable by the one or more client applications. A storage controller is configured to map the client data addresses onto the data bands, such that a mapping is obtained, wherein the one or more client applications can access physical data corresponding to the data bands.

Optimizing locations of data accessed by client applications interacting with a storage system

A method and apparatus are provided for dynamically determining a primary adapter in a heterogeneous N-way adapter configuration. Each of the adapters generates information about itself and exchanges the information with all other adapters. First a decision-making adapter is identified. Then the decision-making adapter compares the adapter-generated information of all the adapters and makes a decision determining the primary adapter. The decision-making adapter communicates the decision to all other adapters. The determined primary adapter assumes a role as the primary adapter and the other adapters assume a role as a secondary adapter.

Apparatus for dynamically determining primary adapter in a heterogeneous N-way adapter configuration

A method, computer program product and system for dynamically optimizing the limit and the thresholds of a write cache for a storage adapter connected to storage devices, includes measuring continually an overall locality of data in the write cache for the storage devices, calculating the limit of the write cache dynamically for each storage device using the overall locality and a device-related information, and calculating the threshold of the write cache dynamically for each storage device by combining a fair amount and a device-related additional amount.

Dynamic optimization of device limits and thresholds in a write cache

A method, computer program product and computer system for maintaining write cache and parity update footprint coherency in a multiple storage adaptor configuration for storage adaptors in a storage subsystem, which includes providing atomic updating of the storage adaptors and the attached disk drives, enabling runtime addition and runtime subtraction of a storage adaptor in the multiple storage adaptor configuration, and maintaining write cache and parity update footprint coherency using atomic updating, runtime addition and runtime subtraction of a storage adaptor.

Maintaining write cache and parity update footprint coherency in multiple storage adaptor configuration

Two stage method for dynamically determining primary adapter in a heterogeneous N-way adapter configuration

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La Crosse, WI, United States of America

Timothy James Larson