Data storage system with localized XOR function

Details Data storage system with localized XOR function Data storage system with localized XOR function

1995-02-28

1998-04-28

Nguyen, Hoa T.

Excavating

395441, 371 511, G06F 1100

Patent

active

057456712

ABSTRACT:
A data storage system including a controller and a string of multiple DASDs, where each DASD is responsive to commands from the controller to perform local operations such as XOR functions and transferring data to other DASDs. A bus, which may comprise a serial or a parallel bus, electrically interconnects the controller and the DASDs. Each DASD includes a storage apparatus, an interface, a buffer, and processor. The buffer selectively receives data from the interface and the storage apparatus. In addition to other operations, the processor is responsive to commands from the controller to the buffer interface to perform an XOR operation on selected items of data in the buffer. The processor may additionally direct the results of the XOR operation to another DASD or to the controller. The data storage system of the invention may advantageously be operated to perform a task requiring the performance of multiple XOR operations, wherein each DASD performs an XOR operation on data and transmits the result to another DASD in accordance with a "daisy chain" specified for that task. Hence, controller workload is reduced and computational efficiency is increased by distributing the XOR operations among the DASDs.

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