System for recovering data stored in failed memory unit

Details System for recovering data stored in failed memory unit System for recovering data stored in failed memory unit

1977-05-31

1978-05-30

Thomas, James D.

Boots, shoes, and leggings

235306, 235312, G06F 1102, G06F 1300

Patent

active

040927326

ABSTRACT:
A storage subsystem comprising a storage control unit and a number of failure independent storage devices, such as disk files, is provided with a check sum generator for generating a check sum segment from segments of a system record as the system record segments are being transferred between the storage subsystem and a CPU of a data processing system. The check sum segments and the associated system record segments are stored on different units so that if one unit containing a system record segment becomes unavailable, the unavailable segment is reconstructed during transfer of the other available segments and the check sum segment to the CPU.

REFERENCES:
patent: 3676851 (1972-07-01), Eastman
patent: 3704363 (1972-11-01), Salmassy

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