Data storage system and method including data and checksum write

Details Data storage system and method including data and checksum write Data storage system and method including data and checksum write

1991-02-01

1993-08-24

Dixon, Joseph L.

Excavating

371 111, 360 9801, 364DIG1, 364DIG2, G06F 1112

Patent

active

052396401

ABSTRACT:
An outboard data storage system for a data processing system including a plurality of data DASD's and a dedicated checksum DASD. Write commands and checksum data calculated from the write commands are placed in a staging area under the control of an intelligent controller, operating in parallel with the data processing system CPU, that acknowledges execution of write commands as they are staged. The controller blocks data with contiguous addresses into single write commands and queues the write commands in an order corresponding to physical DASD addresses. Fast reads are achieved by executing read commands directly from the staging storage area and DASD writes are reduced by preempting write commands in the staging storage area with new write commands having the same address.

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patent: 4870643 (1989-09-01), Bultman et al.
patent: 4989206 (1991-01-01), Dunphy, Jr. et al.
patent: 4993030 (1991-02-01), Krakauer et al.
patent: 5124987 (1992-06-01), Milligan et al.

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