Das device command execution sequence

Details Das device command execution sequence Das device command execution sequence

G - Physics

06

F

354/237

G06F 13/00 (2006.01) G06F 3/06 (2006.01) G06F 13/12 (2006.01)

Patent

CA 1119311

IMPROVED DAS DEVICE COMMAND EXECUTION SEQUENCE 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 DAS subsystem which requires mechanical motion in the DAS device is stored in the subsystem and the subsystem provides a response to the channel indicat- ing 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 mechan- ical 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 com- mand. 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. SA9-78-061

337645

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