Dynamically Alterable Data Transfer Mechanism for Direct Access Storage Device to Achieve Optimal System Performance
Original Publication Date: 1978-Jun-01
Included in the Prior Art Database: 2005-Feb-21
A method is described for dynamically maximizing data transfer rates between a host computer system and an attached direct-access storage device (DASD) subsystem (Fig. 1) subject to DASD operating characteristics and system attachment hardware constraints. In Fig. 1, a central processing unit (CPU) 1 has main storage facilities 2 and is coupled by way of an input/output (I/O) channel 3 and an input/output (I/O) bus 4 to the DASD attachment 5, which in turn has associated DASD units 6-9. Element 5 coupled with any unit 6 to 9 is referred to as a DASD subsystem.