Disk drive with cache employing host pointer jumps during skip-a

Details Disk drive with cache employing host pointer jumps during skip-a Disk drive with cache employing host pointer jumps during skip-a

1997-06-27

1999-03-30

Chan, Eddie P.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711137, 711 3, 711202, 395825, G06F 1208

Patent

active

058902120

ABSTRACT:
A method of managing commands is provided for a disk drive having an intelligent interface for communicating with a host. The drive also has a magnetic disk, host side programs, disk side programs, and a cache wherein the cache is divisible into a number of segments. The cache employs a cache control structure including a cache entry table, a buffer counter, a block count, a host pointer and a disk pointer. The drive receives a first command and a second command with a cache access type. The method of managing commands comprises the steps of: processing the first command to assign the first command to a cache segment having a prefetch area; determining the cache access type of the second command; and if the cache access type of the second command is a skip ahead sequential access then decrementing the buffer counter and incrementing the host pointer to skip leading nonrequested data in the prefetch area for the first command.

REFERENCES:
Grimsrud et al., "Multiple Prefetch Adaptive Disk Caching", IEEE Transactions on Knowledge and Data Engineering, vol. 5, No. 1, pp. 88-103, Feb. 1993.
Shih et al., "A File-Based Adaptive Prefetch Caching Design", IEEE International Conference on Computer Design, Sep. 1990, pp. 463-466.

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