Tape Device Buffer Management Scheme
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
A tape device buffer manager achieves the following two major objectives: 1. Keeps the tape drive device in the streaming mode, which is supplying/receiving data to/from the write/read heads at a fast enough rate to maintain forward tape motion. If data is not supplied/received at a quick enough rate, the tape drive is forced to stop tape motion and resume data transfer when the host has caught up. (Image Omitted) 2. Optimizes performance impact on system DASD operation. The usage of the Small Computer System Interface (SCSI) bus by the tape drive device data transfer can unnecessarily degrade DASD performance.