Disk drive cache system using a dynamic priority sequential stre

Details Disk drive cache system using a dynamic priority sequential stre Disk drive cache system using a dynamic priority sequential stre

1997-05-28

2000-07-18

Cabeca, John W.

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

711137, 711112, G06F 1200

Patent

active

060921498

ABSTRACT:
A magnetic disk drive with a caching system includes an intelligent interface to communicate with a host, a magnetic disk and a cache memory to buffer data transferred to and from the host. The caching system maximizes drive performance based on past access history. The caching system alters execution of commands by coalescing commands or executing internal commands in parallel. The caching system anticipates data requests by using a prefetch to store data that may be requested. The caching system divides the cache memory into segments to store multiple streams of data. The number of segments may be continuously adapted according to the types of access to maximize performance by maintaining a segment for each sequential stream of data. The caching system uses a dynamic priority list to determine segments to maintain and discard. Each segment is monitored to determine access types such as sequential, random, and repeating. The access type determines the amount of data to prefetch and to save, including a minimum and maximum prefetch. The caching system may prescan the cache memory during prefetch to alter the prefetch amount in response to a command request. The caching system may wait for a cache memory access that has not yet occurred. An initiator changes the caching parameters though a mode page.

REFERENCES:
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patent: 5522054 (1996-05-01), Gunlock et al.
patent: 5649156 (1997-07-01), Vishlitzky et al.
patent: 5696931 (1997-12-01), Lum et al.
patent: 5761706 (1998-06-01), Kessler et al.
patent: 5860104 (1999-01-01), Witt et al.

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