Lsi Logic Corporation

Ncr Corporation

Michael A Winchell

Richard D Carmichael

Joel M Ward

Stephen J Bassett

Robin L Steele

A control system in a data storage apparatus and associated methods for attempting to accommodate the vibrations resulting from rotating a data storage medium. The control system comprises a neural network which utilizes detected vibrations resulting from the rotation of data storage media to learn the characteristics of the rotational imbalance of rotating data storage media. Thereafter, the rotation of a data storage medium and/or movement of a data head is controlled based on the characteristics learned.

System for accommodating vibrations resulting from rotating a data storage medium

An apparatus and method for improving the input/output performance of a computer system under the control of a multi-tasking, multi-threaded operating system. In particular, the invention provides an apparatus and method to chain contiguous DMA scatter gather sub blocks of a PRD table for channel 0 with contiguous DMA scatter gather sub blocks of a PRD table for channel 1, using a single data manager, while maintaining maximum media bandwidth. DMA block transfers are scheduled based on the availability of data from the I/O device's buffer memory, thus minimizing both media or network idle time as well as minimizing I/O bus idle time. Near maximum aggregate bandwidth of multiple I/O buses and their associated devices is obtained. The apparatus and method thus provides significant performance advantages over prior techniques having two I/O channel systems implemented with a single data manager.

Method and apparatus for controlling I/O channels responsive to an

A method an corresponding apparatus for improving the input/output performance of a computer system under the control of a multi-tasking, multi-threaded operating system. In particular, the invention provides an apparatus and method to interleave contiguous DMA scatter/gather sub blocks of a PRD table corresponding to a first I/O channel with contiguous DMA scatter/gather sub blocks of a PRD table corresponding to a second I/O channel, using a single data manager, while maintaining maximum media bandwidth. DMA block transfers are scheduled by the single data manager based on the availability of data from the I/O devices' buffer memories, thus minimizing both media or network idle time as well as minimizing I/O bus idle time. Near maximum aggregate bandwidth of multiple I/O buses and their associated devices is obtained. The apparatus and method thus provides significant performance advantages over prior techniques having two I/O channel systems implemented with a single data manager. The apparatus and methods of the present invention are also extended to encompass a plurality 'n' of data managers interleaving contiguous block transfers among a larger plurality 'n+i' of I/O devices.

Method and apparatus for controlling (N+I) I/O channels with (N) data

An improved method for interfacing a human user to the combination of an expert system and a computer aided design system, characterized in that the expert system advice is provided in various formats, the expert system provides for interrupted operation with usable intermediate advice, and expert system advice is transportable in relative correspondence into the computer aided design system schematic display environment.

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Fort Collins, CO, United States of America

Michael A Winchell