US 2006/0150004 A1 · Fault tolerant system and controller, operation method, and operation program used in the fault tolerant system

Abstract

There is provided a fault tolerant system capable of adequately performing error processing, synchronization processing, and resynchronization processing for realizing a fault tolerant function in accordance with the system state. The fault tolerant system comprises at least two systems including: a CPU subsystem; an IO subsystem connected to the CPU subsystem; an FT controller to be connected between the CPU subsystem and IO subsystem; and crosslinks connecting own system and other system through the FT controller. The CPU subsystem operates at the same timing with a CPU subsystem of other system in lock-step. The FT controller manages a plurality of system operations, according to which both systems perform error processing, duplication processing, and resynchronization processing for fault tolerant, by associating a plurality of states corresponding to the system operations with predetermined event signals. According to these event signals, the FT controller selects the system operations while changing the states for every system and allows the CPU subsystem to perform the selected system operation.

Claims20

Dependent claims

A fault tolerant system including a plurality of systems constituted by the same computer hardware components,

each of the systems comprising:
a processor section that can operate in a lock-step synchronous state between own system and other system;
an input/output section to be connected to the processor section;
a controller to be connected between the processor section and input/output section;
and
a signal transmission path that connects the own system and other system through the controller,
the controller comprising:
state management means for managing a plurality of system operations for performing error processing, synchronization processing, and resynchronization processing for fault tolerant by associating a plurality of states corresponding to the system operations with predetermined event signals;
and
control means for selecting the plurality of system operations while changing the plurality of states for every system based on the event signals and allowing the processor section to perform selected system operation.

7 more elements

An operation method used in a fault tolerant system including a plurality of systems constituted by the same processor section and input/output section, the operation method comprising the steps of:

managing a plurality of system operations for performing error processing, synchronization processing, and resynchronization processing for fault tolerant by associating a plurality of states corresponding to the system operations with predetermined event signals;
and
selecting the plurality of system operations while changing the plurality of states for every system based on the event signals and allowing the processor section to perform selected system operation.

An operation program used in a fault tolerant system including a plurality of systems constituted by the same processor section and input/output section, the operation program enabling a computer to execute an operation method comprising the steps of:

managing a plurality of system operations for performing error processing, synchronization processing, and resynchronization processing for fault tolerant by associating a plurality of states corresponding to the system operations with predetermined event signals;
and
selecting the plurality of system operations while changing the plurality of states for every system based on the event signals and allowing the processor section to perform selected system operation.

Dependencies are inferred from the claim text.

Fault tolerant system and controller, operation method, and operation program used in the fault tolerant system

Life of this patent

Fault tolerant system and controller, operation method, and operation program used in the fault tolerant system

Life of this patent

Abstract

Claims20