Cache Storage of DASD Tracks in a Split Mode
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-08
Elapsed time for promoting or staging data from a DASD (direct-access storage device) to its cache is minimized by using a roll mode. That is, reading of any DASD track occurs at the first opportunity to read a full record rather than waiting for index to begin reading. For reduced overhead, the first read record is stored in the lowest address portion of a cache-tracked slot (allocation of cache for storing one track of DASD data). As a result, the index point is at an intermediate point of the track slot.