Disk drive with cache having adaptively aged segments

Details Disk drive with cache having adaptively aged segments Disk drive with cache having adaptively aged segments

1997-12-03

1999-03-30

Bragdon, Reginald G.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711133, 711136, G06F 1208

Patent

active

058902139

ABSTRACT:
A method provides for adaptively aging cache segments in a segmented cache in a disk drive. The disk drive receives commands via an intelligent interface from a host. The drive has a magnetic disk. The cache employs a cache control structure including cache parameters, wherein each segment has a scan count of the number of scans of a segment and an access type, and wherein the cache parameters include a maximum number of misses to indicate the maximum number of times a segment will be scanned without a cache hit. A scan count is maintained for each segment while processing commands from the host. The maximum number of misses is adaptively adjusted based on the access type of the cache segments. The scan count for a segment is compared to the maximum number of misses to determine if the segment should be aged out.

REFERENCES:
patent: 4509119 (1985-04-01), Gumaer et al.
patent: 5253351 (1993-10-01), Yamamoto et al.
patent: 5432919 (1995-07-01), Falcone et al.
patent: 5649156 (1997-07-01), Vishlitzky et al.
patent: 5822759 (1998-10-01), Treynor

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