Sequentially processing data in a cached data storage system

Details Sequentially processing data in a cached data storage system Sequentially processing data in a cached data storage system

1987-07-02

1989-11-21

Shaw, Gareth D.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

364900, 3649593, 3649642, G06F 900

Patent

active

048826421

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 optimized. 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: 4414644 (1983-11-01), Tayler
patent: 4466059 (1984-08-01), Bastian et al.
patent: 4611315 (1986-09-01), Ogino
patent: 4633343 (1986-12-01), Maury et al.
patent: 4796247 (1989-01-01), Vogel Sang

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