Passive bus monitor detects data corruption for block-oriented d

Details Passive bus monitor detects data corruption for block-oriented d Passive bus monitor detects data corruption for block-oriented d

1995-10-31

1998-06-02

Trammell, James P.

Excavating

371 377, H03M 300

Patent

active

057614091

ABSTRACT:
A monitor passively observes traffic on a bus connecting a computer with a block-oriented mass storage device, such as a disc. The monitor parses the traffic on the bus to identify read and write operations and the bus address/block address they are intended for. The monitor creates an original confidence indicator for writes, which it then stores in a memory of its own. The memory location at which the original confidence indicator is stored is defined by a data structure indexed by the bus address/block address combination. When at a later time that same bus address/block address is read from, the monitor creates a comparison confidence indicator from data being sent from the block-oriented mass storage device to the computer, retrieves the corresponding original confidence indicator from the data structure in its memory, and compares the two. If they do not match there has been data corruption and an appropriate indication is issued to the bus or the computer.

REFERENCES:
patent: 5359659 (1994-10-01), Rosenthal
patent: 5488702 (1996-01-01), Byers et al.

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