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Abstract

A digital data processing system comprises a host information generating device, a mass storage subsystem, and a back-up information storage subsystem. The host information generating device generates information and provides it to the mass storage subsystem for storage. The mass storage subsystem receives the generated information from the host information generating device and transfers the generated information to the storage element for storage, and further transfers the generated information to the back-up information storage subsystem. The back-up information storage subsystem receives and stores the generated information from the mass storage subsystem's control element. The back-up information storage subsystem includes a filter/buffer module, a tape log module and a reconstruction module. The filter/buffer module filters and buffers the information received from the mass storage subsystem and provides the buffered information to the tape log module for storage. The tape log module stores the information received from the filter/buffer module in logging fashion on tape cartridges. The filter/buffer module filters the information received from the mass storage subsystem so as to reduce the amount of information to be logged, so that, if the host changes the information while it is being buffered, the filter/buffer module will provide only the most recent information to the tape log module for storage. If a failure occurs in the mass storage subsystem, the reconstruction module can reconstruct the information that was on the failed device using the stored information from the tape log module and the buffered information.

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