Error recovery method and apparatus

Details Error recovery method and apparatus Error recovery method and apparatus

1984-12-19

1987-08-18

Atkinson, Charles E.

Excavating

364200, G06F 1114, G11C 2900

Patent

active

046882219

ABSTRACT:
There is disclosed an error recovery apparatus and method for a data processing system having (1) a peripheral unit, for instance, a magnetic disc unit, for storing data in a plurality of blocks each having a unique address, (2) a main memory for storing data read from the peripheral units, and (3) a controller for controlling the transfer of the data blocks from the peripheral unit to the main memory by execution of a single channel command word (CCW) chain. When an uncorrectable error occurs in the transfer of a second or subsequent data block of the plurality of data blocks (not the first data block), the processor produces a new CCW chain to re-read the data block in error in addition to all the data blocks subsequent to the data blocking error and store these data blocks in the memory under the control of the new CCW chain.

REFERENCES:
patent: Re31069 (1982-10-01), Chang et al.
patent: 3688274 (1972-08-01), Cormier et al.
patent: 3984814 (1976-10-01), Bailey, Jr. et al.
patent: 4092732 (1978-05-01), Ouchi
patent: 4439859 (1984-03-01), Donnan

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