DAS Device command execution sequence

Details DAS Device command execution sequence DAS Device command execution sequence

1978-12-28

1982-01-12

Shaw, Gareth D.

Boots, shoes, and leggings

G06F 1300

Patent

active

043108822

ABSTRACT:
A method and means are provided to increase the effective data transfer rate between a direct access storage device (DASD) and a central processing unit (CPU) communicating with the DAS device through a channel and a DASD control device.
A command issued to the AS subsystem which requires mechanical motion in the DAS device is stored in the subsystem and the subsystem provides a response to the channel indicating that the command has been carried out, without actually carrying out the command. The channel responds by issuing one or more additional commands in the chain to the subsystem which may be carried out without mechanical motion. When a command is issued to the subsystem which again requires mechanical motion of the device, the control device causes the stored command to be executed essentially simultaneously with the newly received command.
This execution of the stored command out of its normal sequence and in parallel with another command involving mechanical motion of the DAS device decreases the time required to perform operations with the DASD subsystem.

REFERENCES:
patent: 3346852 (1967-10-01), Smeltzer
patent: 3480917 (1969-11-01), Day
patent: 3573743 (1971-04-01), Hadd et al.
patent: 3898623 (1975-08-01), Cormier
patent: 3936804 (1976-02-01), Bachman
patent: 3956738 (1976-05-01), Tessera
patent: 4092732 (1978-05-01), Ouchi
Opdahl, Jr. "New Command for Improving I/O Channel Buffering", IBM Tech. Disc. Bull, vol. 19, No. 11, Apr. 1977, pp. 4235-4236.

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