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A cache protocol for error detection and recovery in fault-tolerant computing systems

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2 Author(s)
Chung-Ho Chen ; Dept. of Electr. Eng., Nat. Yunlin Inst. of Technol., Taiwan ; Somani, A.K.

We propose an error detection and recovery protocol for redundant processor systems employing caches. The protocol allows cache-based systems to vote more often and thereby reduce the chance of losing synchronization. The scheme is based on cache data broadcasting of a dirty line after modification. The scheme effectively exploits the redundancy of a fault-tolerant system using hardware voting. It recovers from erroneous data written by a processor and this remedies the insufficiency of error-correcting codes. The protocol can also be used to speed-up resynchronization process for a temporarily failed processor in a redundant system. More than 60% of cache lines are fully covered for recovery due to errors originated from the cache itself, including unrecoverable ECC errors. The performance overhead is to broadcast only 2-3% of the total memory references.<>

Published in:

Fault-Tolerant Computing, 1994. FTCS-24. Digest of Papers., Twenty-Fourth International Symposium on

Date of Conference:

15-17 June 1994

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