Error detection/correction and fault detection/recovery – Data processing system error or fault handling – Reliability and availability
Reexamination Certificate
2006-01-24
2006-01-24
Beausoliel, Robert (Department: 2113)
Error detection/correction and fault detection/recovery
Data processing system error or fault handling
Reliability and availability
C714S004110, C714S011000, C707S793000
Reexamination Certificate
active
06990608
ABSTRACT:
A modified transaction registration protocol is disclosed. The registration protocol is inherently centralized in that processes requesting registration to participate in the work of a transaction, must send a request to a Broadcast Owner CPU which is the CPU that initiated the transaction. The processes wait, suspended, until a response is received from the Broadcast Owner CPU. However, if the Broadcast Owner CPU fails to respond to the registration request, then the processes that are waiting are incapable performing work for the transaction. While a CPU failure may not occur often, in a fault-tolerant system, such events must be accounted for. Therefore, the transaction registration protocol is modified to revert to a Full Broadcast transaction protocol and complete any outstanding registration requests. This is accomplished by distributing transactions to all of the CPUs in the system, and in each CPU forcing the completion of registration requests in each CPU.
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Hege David C.
Johnson Charles Stuart
Tate Jim B.
Wisler David J.
Wisler Trina R.
Beausoliel Robert
Duncan Marc
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