Multilevel storage system with hybrid data compression

Details Multilevel storage system with hybrid data compression Multilevel storage system with hybrid data compression

1997-09-15

2000-02-29

Choules, Jack M.

Data processing: database and file management or data structures

Database design

Data structure types

711117, G06F 1730

Patent

active

060321482

ABSTRACT:
A multilevel data storage system that comprises an interface, an upper-level storage device, a lower-level storage device and first and second compression state modifying engines. Data are transferred through the interface in a first compression state. Data are stored in the upper-level storage device in a second compression state that is higher than the first compression state. Data are stored in the lower-level storage device in a third compression state that is lower than the second compression state. The first compression state modifying engine is located between the interface and the upper-level storage device. The second compression state modifying engine is located between the upper-level storage device and the lower-level storage device.

REFERENCES:
patent: 4758980 (1988-07-01), Tsunekawa et al.
patent: 5245337 (1993-09-01), Bugajski et al.
patent: 5684986 (1997-11-01), Moertl et al.
Douglis, Fred, "The Compression Cache: Using On-Line Compression to Extend Physical Memory", USENIX Conference, Jan. 1993, pp. 519-529.

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