Storage unit with improved performance by purging...

Details Storage unit with improved performance by purging... Storage unit with improved performance by purging...

2007-01-30

2007-01-30

Padmanabhan, Mano (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Specific memory composition

C711S133000

Reexamination Certificate

active

10151241

ABSTRACT:
A storage unit which purges unnecessary data immediately and transfers data with high probability of future hits from a disk medium to a segment buffer in advance. A section calculates feature values of data to be stored in a new generated segment and relationships between preceding and succeeding commands. Next, a section retains the feature values for a predetermined period after segment data is purged from a segment buffer and stores the feature values of the purged segment as feature values of a segment with a high hit probability after the purge, when an address stored by the purged segment is read again. Then, a section does not purge a segment when the segment has feature values similar to those of the segment having a high hit probability, while purging another segment or other plural segments with a different feature value.

REFERENCES:
patent: 5652857 (1997-07-01), Shimoi et al.
patent: 5787466 (1998-07-01), Berliner
patent: 6397296 (2002-05-01), Werner
patent: 6397302 (2002-05-01), Razdan et al.
patent: 6636946 (2003-10-01), Jeddeloh

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