System and method for maintaining a minimum quality of service d

Details System and method for maintaining a minimum quality of service d System and method for maintaining a minimum quality of service d

1995-08-10

1997-10-21

Beausoliel, Jr., Robert W.

395427, G06F 1134

Patent

active

056805381

ABSTRACT:
A disk array system and method which maintains a minimum data delivery requirement or minimum quality of service during varying conditions. The present invention utilizes the alternate data paths available to maintain minimum data delivery requirements under varying types of conditions, including both normal and degraded conditions as well as transitions between these conditions. According to the present invention, the disk controller receives a data read request from the host and issues a plurality of read requests for the data using a plurality of different data paths. These read requests operate in parallel to retrieve the desired data from the drives using the different data paths. Thus, if one or more of the requests falls, the other requests being performed contemporaneously will soon complete or will have completed returning the correct data. This guarantees that the correct data is returned even in instances where one or more of the data paths returns incorrect data. This also provides that data recovery operations can be performed much more efficiently since the correct data returned from one of the data paths is readily available for data recovery operations.

REFERENCES:
patent: 5283791 (1994-02-01), Halford
patent: 5331646 (1994-07-01), Krueger et al.
patent: 5345565 (1994-09-01), Jibbe et al.
patent: 5463643 (1995-10-01), Gaskins et al.
patent: 5526507 (1996-06-01), Hill
patent: 5544339 (1996-08-01), Baba

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