Patent
1989-09-14
1992-07-28
Bowler, Alyssa H.
G06F 700, G06F 720
Patent
active
051345633
ABSTRACT:
The disclosure relates to sequential performance of a cached data storage subsystem with a minimal control signal processing. Sequential access is first detected by monitoring and examining the quantity of data accessed per unit of data storage (track) across a set of contiguously addressable tracks. Since the occupancy of the data in the cache is usually time limited, this examination provides an indication of the rate of sequential processing for a data set, i.e., a data set is being processed usually in contiguously addressable data storage units of a data storage system. Based upon the examination of a group of the tracks in a cache, the amount of data to be promoted to the cache from a backing store in anticipation of future host processor references is optimizied. A promotion factor is calculated by combining the access extents monitored in the individual data storage areas and is expressed in a number of tracks units to be promoted. The examination of the group of tracks units and the implementation of the data promotion and demotion (early cast-out) is synchronized which results in a synergistic effect for increasing throughput of the cache for sequentially-processed data. A limit of promotion is determined to create a window of sequential data processing.
REFERENCES:
patent: 3898624 (1975-08-01), Tobias
patent: 4262332 (1981-04-01), Bass et al.
patent: 4414644 (1983-11-01), Taylor
patent: 4429363 (1984-01-01), Duke et al.
patent: 4466059 (1984-08-01), Bastian et al.
patent: 4533995 (1985-08-01), Christian et al.
patent: 4611315 (1986-09-01), Ogino
patent: 4633343 (1986-12-01), Maurt et al.
patent: 4796247 (1989-01-01), Vogelsang
patent: 4882642 (1989-11-01), Tayler
Tayler Gerald E.
Wagner Robert E.
Bowler Alyssa H.
International Business Machines - Corporation
Somermeyer H. F.
LandOfFree
Sequentially processing data in a cached data storage system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sequentially processing data in a cached data storage system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sequentially processing data in a cached data storage system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1691003