Controller for receiving transfer requests for noncontiguous sec

Details Controller for receiving transfer requests for noncontiguous sec Controller for receiving transfer requests for noncontiguous sec

1994-03-28

1995-12-05

Lee, Thomas C.

Boots, shoes, and leggings

395894, 395846, 395441, 395439, 395481, 39549701, 364345, 3642451, 3642452, 364DIG1, G06F 1314

Patent

active

054737613

ABSTRACT:
A disk drive array including a controller which provides scatter/scatter (bi-directional scatter/gather) operations between noncontiguous host memory address locations and noncontiguous disk address locations. The host provides a single request to launch a scatter/scatter transfer. The single data request includes a pointer to a list of transfer counts and addresses, the length of the list, and the starting logical address on the disk transfer. Skipped blocks in a scatter/scatter request are specified by data address value of -1, and a no-operation (no-op) request is enqueued for each skipped block. Thus, during reads the controller extends the scattered read from the disk into a single large read of contiguous sectors and suppresses the unwanted data by inserting "no-operation" commands in place of the read commands during the transfer to the host.

REFERENCES:
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patent: 4618897 (1986-10-01), Johnson et al.
patent: 5140592 (1992-08-01), Idleman et al.
patent: 5150465 (1992-09-01), Bush et al.
patent: 5170481 (1992-12-01), Begun et al.
patent: 5179666 (1993-01-01), Rimmer et al.
patent: 5251303 (1993-10-01), Fogg, Jr. et al.

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