International Business Machines Corporation

Globalfoundries Inc.

William J Maitland, Jr

Robert Edward Galbraith

Adrian Cuenin Gerhard

Leah J Busboom

Timothy James Larson

Alex A Akiyama

Timothy J Schimke

Brian James King

Brian Eric Bakke

Joseph R Edwards

Clark A Anderson

Rick A Weckwerth

Stephen M Tee

Dennis Carl Mairet

A first cache of a first IOA is detected storing an amount of data that satisfies a memory shortage threshold. A request for extra memory for the first IOA is transmitted. The request is sent in response to detecting that the first cache stores the amount of data that satisfies the memory shortage threshold. The request is transmitted to a plurality of IOAs of a computer system. A second cache of a second IOA is detected storing an amount of data that satisfies a memory dissemination threshold. Memory of the second cache is allocated to the first cache. The memory is allocated in response to the request and the amount of data in the second cache satisfying the memory dissemination threshold.

Managing memory allocation between input/output adapter caches

A method, system and computer program product are provided for implementing enhanced data caching and takeover of non-owned storage devices in a computer system. Each of a first controller and a second controller has a cache memory. During normal run-time, each storage device controller validates cached write data after it is written to its cache memory by reading the write data from its cache memory. If any error is detected on the read, then unit check failed storage device controller, which results in a reset of the failed storage device controller. When a storage device controller detects its dual partner controller fails, the surviving storage device controller queues host read/write operations for its storage devices already owned, and tests a cache mirrored copy from its cache memory of the failed first storage device controller before takeover of the failed controller's storage devices.

Implementing enhanced data caching and takeover of non-owned storage devices in dual storage device controller configuration with data in write cache

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

In a first aspect, a method is provided for updating a compressed cache. The method includes the steps of (1) initiating an update routine for replacing first data stored within the cache with second data, wherein a first section of a compressed data band stored in the cache includes the first data and a second section of the compressed data band includes third data; and (2) in response to initiating the update routine, replacing the first data within the compressed data band with the second data without decompressing the third data. Numerous other aspects are provided.

Method and system for updating data in a compressed read cache

A computer display has a display processor connected to a presentation space buffer and a screen buffer. The presentation space buffer is larger than the screen buffer, and is divided into a plurality of partitions. Each partition has a partition window which maps into the screen buffer. If a partition is active, its associated partition window is written into the screen buffer at the mapped location. The screen buffer periodically refreshes the display screen, so a plurality of partition windows are displayed to the computer user. One or more scroll groups can be defined, and one or more partitions can be assigned to each scroll group. Each defined scroll group has a vertical scroll trigger and a horizontal scroll trigger. The display monitors the movement of the cursor within a partition window. When the cursor gets close enough to a boundary of a partition window, to trigger a scroll trigger, the display shifts the partition window within its partition and writes this updated partition window into the screen buffer. Updated partition windows are written into the screen buffer for the other partitions in the scroll group.

Display with enhanced scrolling capabilities

An enhanced fixed function video display terminal having various features for the efficient transmission of data streams. The video display terminal may have a memory for storing substantially more characters than can be displayed to the operator on the display screen width and length. This permits manipulation of data at document page boundaries, scrolling, etc. One or more extended attribute buffers are added to enable characters to be displayed in a variety of fonts, colors, etc. The data stream from the host computer to the display terminal and from the display terminal to the host computer contains data characters and attribute characters which are interleaved for efficiency in input/output programming. When receiving data, the display terminal has the capability of parsing the data stream into data or attribute characters and adding pad characters to completely fill the display buffers. Similarly, the display terminal interleaves data and attribute characters and compacts the data stream by stripping pad characters when sending data back to the host computer.

Growing community of inventors

Rochester, MN, United States of America

William J Maitland, Jr