Channel-initiated retry and unit check for peripheral devices

Details Channel-initiated retry and unit check for peripheral devices Channel-initiated retry and unit check for peripheral devices

1994-08-15

1995-02-21

Beausoliel, Jr., Robert W.

Excavating

371 12, G06F 1100

Patent

active

053924258

ABSTRACT:
Retrying a command from a CCW in a data processing I/O system having a channel connected to a control unit in which the channel detects an error condition and requests the control unit to retry the current command of an I/O operation. The control unit then determines if the requested retry can be accomplished, and, if it can, sends a response back to the channel requesting the channel to initiate a retry. After receiving the response, the channel checks to determine if conditions are still present which allow a retry, and if they are, executes the current command to perform the retry. If the control unit determines that a retry cannot be accomplished, the control unit has the option to perform a unit check procedure. If the control unit determines that neither a retry nor a unit check can be accomplished, the control unit has the option to perform a selective reset function.

REFERENCES:
patent: Re31069 (1982-10-01), Chang
patent: 3688274 (1972-08-01), Cormier et al.
patent: 3704363 (1972-11-01), Salmassy
patent: 3984814 (1976-10-01), Bailey
patent: 4209809 (1980-06-01), Chang
patent: 4688221 (1987-08-01), Nakamura
IBM Technical Disclosure Bulletin, vol. 33, No. 10B, Mar. 1991, pp. 287-297, Serial I/O Architecture Ordered-Set/Sequence Reception and Protocol for Managing Sequences.

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