Robert S Wagner
Radiology at Sabino Cyn Rd, Tucson, AZ

5119291, Jun 2, 1992

May 1, 1990

7/517287

William J. Flannagan - Tucson AZ
Ronald M. Kern - Tucson AZ
John E. Kulakowski - Tucson AZ
Robert E. Wagner - Tucson AZ

International Business Machines Corporation - Armonk NY

G06F 1200

395275

An updatable and expandable directory structure and resultant access procedures emulating a write-once or indelible record medium to a rewriteable record medium as to accessing characteristics. The directory is indexed; one directory header for a first set of files indexes another set of files. Sector clusters or data extends are managed such that random recording from any file proceeds independently of write-once characteristics. The directory is stored on the medium as data is recorded. Each directory entry contains an archival history of recording of a related data file in the medium. Both logical and physical addressing is employable.

4882642, Nov 21, 1989

Jul 2, 1987

7/068857

Gerald E. Tayler - Berthoud CO
Robert E. Wagner - Tucson AZ

International Business Machines Corporation - Armonk NY

G06F 900

360 7811

The disclosure relates to sequential performance of a cached data storage subsystem with a minimal control signal processing. Sequential access is first detected by monitoring and examining the quantity of data accessed per unit of data storage (track) across a set of contiguously addressable tracks. Since the occupancy of the data in the cache is usually time limited, this examination provides an indication of the rate of sequential processing for a data set, i. e. , a data set is being processed usually in contiguously addressable data storage units of a data storage system. Based upon the examination of a group of the tracks in a cache, the amount of data to be promoted to the cache from a backing store in anticipation of future host processor references is optimized. A promotion factor is calculated by combining the access extents monitored in the individual data storage areas and is expressed in a number of tracks units to be promoted. The examination of the group of tracks units and the implementation of the data promotion and demotion (early cast-out) is synchronized which results in a synergistic effect for increasing throughput of the cache for sequentially-processed data.

5134563, Jul 28, 1992

Sep 14, 1989

7/407078

Gerald E. Tayler - Berthoud CO
Robert E. Wagner - Tucson AZ

International Business Machines Corporation - Armonk NY

G06F 700, G06F 720

395250

The disclosure relates to sequential performance of a cached data storage subsystem with a minimal control signal processing. Sequential access is first detected by monitoring and examining the quantity of data accessed per unit of data storage (track) across a set of contiguously addressable tracks. Since the occupancy of the data in the cache is usually time limited, this examination provides an indication of the rate of sequential processing for a data set, i. e. , a data set is being processed usually in contiguously addressable data storage units of a data storage system. Based upon the examination of a group of the tracks in a cache, the amount of data to be promoted to the cache from a backing store in anticipation of future host processor references is optimizied. A promotion factor is calculated by combining the access extents monitored in the individual data storage areas and is expressed in a number of tracks units to be promoted. The examination of the group of tracks units and the implementation of the data promotion and demotion (early cast-out) is synchronized which results in a synergistic effect for increasing throughput of the cache for sequentially-processed data.

4956803, Sep 11, 1990

Sep 14, 1989

7/407077

Gerald E. Tayler - Berthoud CO
Robert E. Wagner - Tucson AZ

International Business Machines Corporation - Armonk NY

G06F 900

364900

The disclosure relates to sequential performance of a cached data storage subsystem with a minimal control signal processing. Sequential access is first detected by monitoring and examining the quantity of data accessed per unit of data storage (track) across a set of contiguously addressable tracks. Since the occupancy of the data in the cache is usually time limited, this examination provides an indication of the rate of sequential processing for a data set, i. e. , a data set is being processed usually in contiguously addressable data storage units of a data storage system. Based upon the examination of a group of the tracks in a cache, the amount of data to be promoted to the cache from a backing store in anticipation of future host processor references is optimized. A promotion factor is calculated by combining the access extents monitored in the individual data storage areas and is expressed in a number of tracks units to be promoted. The examination of the group of tracks units and the implementation of the data promotion and demotion (early cast-out) is synchronized which results in a synergistic effect for increasing throughput of the cache for sequentially-processed data.

4837680, Jun 6, 1989

Aug 28, 1987

7/090722

Robert N. Crockett - Tucson AZ
Robert F. Kern - Tucson AZ
Arnold G. Miller - Tucson AZ
Richard E. Norris - Tucson AZ
Michael W. Pousson - Tucson AZ
Robert E. Wagner - Tucson AZ

International Business Machines Corporation - Armonk NY

G06F 300

364200

A plurality of host processors share access to a peripheral data storage subsystem and each have program means for controlling asynchronous operations of the subsystem. Control blocks in each of the host processors are addressably linked together for enabling inferred access to a unit control block (UCB) for any of a plurality of peripheral devices in the subsystem. The subsystem selectively groups some of the devices such that only devices designated as primary devices are addressably accessible by host processor application programs. Other devices in the respective groups are secondary devices and are accessed by the subsystem whenever the primary devices in the same group cannot perform a host processor commanded operation. Means are provided for identifying the secondary devices to all of the host processors.

4827462, May 2, 1989

Mar 26, 1987

7/030393

William J. Flannagan - Tucson AZ
Ronald M. Kern - Tucson AZ
John E. Kulakowski - Tucson AZ
Robert E. Wagner - Tucson AZ

International Business Machines Corporation - Armonk NY

G11B 1722

369 32

An updatable and expandable directory structure and resultant access procedures emulating a write-once or indelible record medium to a rewriteable record medium as to accessing characteristics. The directory is indexed; one directory header for a first set of files indexes another set of files. Sector clusters or data extents are managed such that random recording from any file proceeds independently of write-once characteristics. The directory is stored on the medium as data is recorded. Each directory entry contains an archival history of recording of a related data file in the medium. Both logical and physical addressing is employable.