Fault tolerant computer system - has working memories in redundant computers divided into high-cost, fail-safe regions and low-cost regions for active and inactive data

摘要

The fault tolerant computer system has two redundant computer units (U0,U1) each with a working memory (M0,M1) and processor connected via a channel (MC) via which the processors exchange state signals identifying the active and standby processor. The active processor writes data into both memories. Both computer units can detect faults. Each processor can only read its associated memory. The working memory is divided into a high cost, fail-safe region (ARS0,ARS1) in which the current operation data are placed and a lower cost region (SP0,SP1) contg. the remaining data. The active processor only writes into the fail-safe regions. ADVANTAGE - System provides partic. low-cost, fault tolerant transaction processing.