Method and system for minimizing seek affinity and enhancing wri

Details Method and system for minimizing seek affinity and enhancing wri Method and system for minimizing seek affinity and enhancing wri

1992-12-11

1995-05-16

Gossage, Glenn

Excavating

371 101, 364DIG1, 395575, G06F 1116, G06F 1206

Patent

active

054169151

ABSTRACT:
A method and system for minimizing seek affinity and enhancing write sensitivity in a direct access storage device (DASD) array are disclosed. SEEK affinity and WRITE efficiency are preserved in which logical cylinders, as recorded on the DASD array, are managed as individual log structured files (LSF). Tracks or segments of data and parity blocks having the same or different parity group affinity and stored on the same or different DASD cylindrical addresses are written into a directory managed buffer. Blocks having the same parity affinity and written to counterpart cylinders are written out from the buffer to spare space reserved as part of each DASD cylinder. Otherwise, blocks are updated in place in their DASD array location.

REFERENCES:
patent: 4207609 (1980-06-01), Luiz et al.
patent: 4914656 (1990-04-01), Dunphy et al.
patent: 5155835 (1992-10-01), Belsan
Patterson, et al, "A Case for Redundant Arrays of Inexpensive Disks (RAID)," Report No. UCB/CSD 87/391, Dec. 1987.

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