Robert V Fish

US Patent:

58782788, Mar 2, 1999

Filed:

Jul 12, 1996

Appl. No.:

8/679167

Inventors:

Paul Peixoto Carreiro - San Jose CA
Alena Chang - San Jose CA
Duc Tich Doan - Fremont CA
Robert R. Fish - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1314

US Classification:

395859

Abstract:

A data processing system includes a central processing complex consisting of one or more processor units, each of the processor units having one or more input/output channels, a transmission medium connected to each of the input/output channels, and one or more peripheral device controllers such as for controlling one or more direct access storage devices (DASD). In systems having more than one input/output channels, it is common to include a switching mechanism connected between the input/output channels and the control devices for enabling connection between one of a number of controllers and one of a number of channels. Each control device will include an automatic frame transmission function which includes apparatus and method for controlling transmission of frames of information between the control device and the channel. A queue of reconnection requests is constructed and a state machine controls the queue. For example, the state machine reads the queue, loads and sends frames from the controller to the channel, manages a redrive timer and automatically redrives or terminates automatic frame transmission processing depending on system parameters and responses received from the channel or from another controller in controller to controller transmissions.

US Patent:

55618243, Oct 1, 1996

Filed:

Oct 4, 1994

Appl. No.:

8/322441

Inventors:

Paul P. Carreiro - San Jose CA
Robert R. Fish - San Jose CA
David R. Nowlen - Morgan Hill CA
Duc T. Doan - Fremont CA
James T. Brady - San Jose CA
Philip G. Bowser - San Jose CA

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1338

US Classification:

395872

Abstract:

A method and apparatus for ensuring the communication of a minimal length data stream in a system including a host and a storage management device is provided. The method and apparatus includes first and second buffers for simultaneously receiving compressed data and the original data from the host. The system compares the length of the data in the first and second buffers. If the data has expanded, indicating that compressed data is longer than the original data, the original data is provided to the storage media. If the data has not expanded, indicating that the original data is longer than the compressed data, then the compressed data is provided to the storage media.

US Patent:

56300921, May 13, 1997

Filed:

Jan 2, 1996

Appl. No.:

8/581719

Inventors:

Paul P. Carreiro - San Jose CA
Robert R. Fish - San Jose CA
David R. Nowlen - Morgan Hill CA

Assignee:

International Business Machines - Armonk NY

International Classification:

G06F 1202
G06F 1300

US Classification:

395438

Abstract:

A system and method are provided for sharing a data stream between a first data storage system in communication with a second data storage system. Meta-data is associated with each record of the data stream. Zero or more records of the data stream are compressed at the first storage system. The meta-data for the compressed data record is updated to indicate that the data record has been compressed. The data stream including the compressed data record with the updated meta-data is sent to the second storage system. The meta-data and the data stream records are stored on a storage device at the second data storage system.