International Business Machines Corporation

Ian David Judd

Robert Bruce Nicholson

Reginald Beer

Paul Nicholas Cashman

Robert Frank Maddock

Paul Hooton

Renato John Recio

Henry Esmond Butterworth

Neil Morris

Barry Douglas Whyte

Thomas Anthony Gregg

David F Craddock

Carlos Francisco Fuente

Gregory Francis Pfister

Paul Jonathan Quelch

Mandy A Stevens

Michael T Benhase

Donald W Schmidt

Daniel Frank Moertl

Karl Allen Nielsen

William James Scales

Patrick Allen Buckland

Gordon J Cockburn

Vinay V Shah

Steven John Hyatt

Stephen Arthur Randle

Barry Douglas White

David Arlen Elko

Wen-Tzer Thomas Chen, Jr

Bruce Leroy Beukema

Stephen Gouze Luning

Michael John Palmer

Norman Apperley

Pat Allen Buckland

John F Minshull

Bernard John Grainger

Peter John Deacon

Gary Robert Lyons

Robert W Farr

Alistair Leask Symon

Paul Jonathan Ouelch

William A Short

Roger G Cath

Mandy Alexander Gray

Michael J Szatkowski

Michael Francis Scully

Nik Shaylor

Richard H Lovie

John M Evans

Steve John Hyatt

Provided are an apparatus and method for managing data storage. A first log structured array stores data in a storage device. A second log structured array in the storage device stores metadata for the data in the first log structured array, wherein the second log structured array storing the metadata for the first log structured data storage system is nested within the first log structured array, and wherein the first and second log structured arrays comprise separate instances of log structured arrays. Address space is allocated in the second log structured array for metadata when the allocation of address space is required for metadata for data stored in the first log structured array.

Apparatus and method for managing data storage

Provided is an enclosure for use in a modular storage system, the enclosure comprising a plurality of drive bays, a controller canister, an expansion canister, and a midplane connecting the drive bays to the canisters, wherein the controller canister occupies a greater volume of the enclosure than the expansion canister.

Configuring a modular storage system

A method of controlling data transfers between a volatile memory and a non-volatile storage, the volatile memory being on a memory device operatively coupled to a computer system, the data transfers comprising: storing data from the volatile memory to the non-volatile storage when a power source of the computer system fails, the method comprising following re-establishment of the previously failed power source, the step of: selectively restoring data from the non-volatile storage to the volatile memory by a controller software after restart operations.

Selective restoration of data from non-volatile storage to volatile memory

A Redundant Array of Independent Disks (RAID) controller receives new data that is to be written, wherein the new data is indicated in blocks of a first block size. The RAID controller reads old data, and old parity that corresponds to the old data, stored in blocks of a second block size that is larger in size than the first block size. The RAID controller computes new parity based on the new data, the old data, and the old parity. The RAID controller writes the new data and the new parity aligned to the blocks of the second block size, wherein portions of the old data that are not overwritten by the RAID controller are also written to the blocks of the second block size.

Writing of new data of a first block size in a raid array that stores both parity and data in a second block size

An apparatus for controlling a log-structured data storage system, operable with a first log-structured data storage area for storing data, comprises a metadata storage component for controlling the first log-structured data storage area and comprising a second log-structured data storage area for storing metadata; and means for nesting the second log-structured data storage area for storing metadata within the first log-structured data storage area. The apparatus may further comprise at least a third log-structured data storage area for storing further metadata, and means for nesting the at least a third log-structured data storage area within the second log-structured data storage area.

Logic is provided for increasing energy-efficiency of a data processing system. First logic continuously checks a plurality of I/O ports for incoming workload. Responsive to the incoming workload being lower than a low workload threshold for a current operating frequency, second logic reduces an operating frequency of the processor. Responsive to the incoming workload being higher than a high workload threshold, the second logic increases the operating frequency of the processor.

Energy-efficient polling loop

According to one general embodiment of the present invention, there is provided a computer program product for reducing incidence of errors in connections between a power consumer apparatus operable to draw a load and a power supply apparatus capable of varying the power supplied, the computer program product comprising: a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code comprising: computer readable program code configured to generate at the power consumer apparatus an identifiable pattern in a load to be drawn from a power supply connection to a power supply apparatus; and computer readable program code configured to monitor at the power consumer apparatus for a change in the load corresponding to the pattern, the monitoring being performed across a signal connection to the power supply apparatus; wherein a positive result of the monitoring indicates a correct configuration. Additional embodiments are also presented.

Connection error avoidance for apparatus connected to a power supply

An apparatus for a node of a peer-to-peer network having a plurality of nodes comprises one or more I/O adapters; a cache component; one or more inter-node routing components; a memory mapping component for presenting to the I/O adapters a single address space mapped across a plurality of memory elements each associated with the cache component; and a direct memory access component for performing a memory operation on the memory elements via the memory mapping component on behalf of the I/O adapters.

Data storage system with shared cache address space

Growing community of inventors

Winchester, United Kingdom

Ian David Judd