| 摘要 |
A fault tolerant processing apparatus 1 includes an off-host controller 12 which monitors operations of a communications circuit 13 and, on detection of a communications fault, sets a switch to the offline state and retrieves a remote host processor simulation programs from a fixed disk drive 4. This allows a local processor 2 to carry out processing operations while there is a communications fault. When communications is re-established the switch is set to the recovery state and captured data resulting from off-host processing is trickle fed to the host processor provided batch processing operations are not taking place at the host processor. The off-host controller 12 automatically generates reconnection signals while offline. Validation operations are carried out on data which is being trickle fed and access to the processor 2 may not be achieved unless security procedures are adhered to after the setting of the switch to the online state after recovery of data. <IMAGE> |
