Data storage apparatus for disk array

Details Data storage apparatus for disk array Data storage apparatus for disk array

1995-06-07

1997-08-19

Beausoliel, Jr., Robert W.

Excavating

371 404, 395441, G11B 548

Patent

active

056596774

ABSTRACT:
A data storage disk device for a RAID disk array is disclosed, comprising a rotatably mounted disk having a data storage surface; a first head for reading data from and writing data to the data storage surface; with a second head for reading data from the data storage surface; and control means for executing a write operation to a sector, said write operation including reading the contents of the sector via the second head for subsequent processing and writing new data to the sector via the first head, the first and second heads being arranged with respect to the data storage surface so that the new data can be written to the sector on the same revolution of the disk as the reading operation. The addition of a second head to the disk storage device improves performance of the disk device for RAID applications.

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patent: 5398253 (1995-03-01), Gordon
patent: 5423054 (1995-06-01), Schmidt
Gibson et al, "A Case for Redundant Arrays of Inexpensive Disks" (RAID), University of California Berkeley, ACM, 1988, pp. 109-116.
Rosenblum and Ousterhout, "The Design and Implmenations of a Log-Structured File System", ACM Transactions on Computer Systems, vol. 10, No. 1, Feb. 1992, pp. 26-52.

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