Invalid data detection, recording and nullification

Details Invalid data detection, recording and nullification Invalid data detection, recording and nullification

1992-12-22

1996-06-18

Nguyen, Hoa T.

Boots, shoes, and leggings

39518401, 3642663, G06F 1134, G06F 706

Patent

active

055287557

ABSTRACT:
Often in DASD subsystems, circumstances can occur which prevent the full transfer of the required data from channel to subsystem during a write operation. The disclosed methods prevents this data from later being read and treated as valid data by the host processor. This is achieved by marking data as invalid within the storage subsystem once it is determined that a channel error has occured. Subsequently, upon reading that data, the host processor can be made aware of the data invalidity and treat the data accordingly. In a second embodiment, invalid data is discarded rather than stored over the previous valid version of the data, before it is ever stored on DASD.

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patent: 5146461 (1992-09-01), Duschatko et al.
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