Device and method for fault tolerant dual fetch and store

Details Device and method for fault tolerant dual fetch and store Device and method for fault tolerant dual fetch and store

1994-12-06

1997-05-13

Beausoliel, Jr., Robert W.

Boots, shoes, and leggings

395726, 395728, 3642468, G06F 1134

Patent

active

056300450

ABSTRACT:
Fault tolerant systems allow continuous service during the occurrence of a hardware failure. To provide such service, usually dual copies of data are stored in case of a hardware failure affecting the original copy. This dual copying causes the system an overall performance degradation. The present invention discloses a device and method for performing parallel fetch and store commands, allowing multiple copying of data into storage without affecting the performance of the system. In one embodiment of the invention, a method is described utilizing a multiprocessor system having two system controllers (SCs) and a plurality of requestors defined as a plurality of central processors (CPs) and input-output (I/O) processors. Asymmetric structure is accomodated. Single and dual requests can be intermixed. Each requestor has access to both system controllers, allowing either controller to process a requestor issued command. An interlocking data protection mechanism is also provided to protect data integrity by allowing requestors data access to a given unit of data only on a one at a time basis. Data exclusivity ownership access to a given unit of data is being provided by and removed by the system controllers. When a command is issued by one of the requestors, the system controllers process the command and provide the requestor with a response upon processing completion. In the mean time, the requestor can perform any required data updates. This concurrent processing improves the performance of the system but also protects its integrity.

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