1
Drew Major, Kyle Powell, Dale Neibaur: Fault tolerant computer system. Novell, Hecker & Harriman, October 20, 1992: US05157663 (268 worldwide citation)

A method and apparatus for providing a fault-tolerant backup system such that if there is a failure of a primary processing system, a replicated system can take over without interruption. The invention provides a software solution for providing a backup system. Two servers are provided, a primary an ...


2
Douglas E Jewett, Phil Webster, Dave Aldridge, Peter C Norwood, Nikhil A Mehta: Fault-tolerant computer system with auto-restart after power-fall. Tandem Computers Incorporated, Graham & James, May 31, 1994: US05317752 (210 worldwide citation)

A fault-tolerant computer system employs a power supply system including a battery backup so that upon AC power failure the system can execute an orderly shutdown, saving state to disk. A restart procedure restores the state existing at the time of power failure if the AC power has been restored by ...


3
Richard S Ohran, Richard N Rollins, Michael R Ohran, Wally Marsden: Method for improving recovery performance from hardware and software errors in a fault-tolerant computer system. Vinca Corporation, Workman Nydegger Seeley, September 22, 1998: US05812748 (193 worldwide citation)

A method for providing rapid recovery from a network file server failure through the use of a backup computer system. The backup computer system runs a special mass storage access program that communicates with a mass storage emulator program on the network file server, making the disks (or other ma ...


4
Douglas E Jewett, Tom Bereiter, Brian Vetter, Randall G Banton, Richard W Cutts Jr, Donald C Westbrook deceased, Kyran W Fey Jr, John Pozdro, Kenneth C Debacker, Nikhil A Mehta: Fault-tolerant computer system with online recovery and reintegration of redundant components. Tandem Computers Incorporated, Graham & James, March 15, 1994: US05295258 (160 worldwide citation)

A computer system in a fault-tolerant configuration employs multiple identical CPUs executing the same instruction stream, with multiple, identical memory modules in the address space of the CPUs storing duplicates of the same data. The system detects faults in the CPUs and memory modules, and place ...


5
Gradimir Starovic, Martin P Mayhead: Software fault tolerant computer system. Sun Microsystems, B Noël Kivlin, Meyertons Hood Kivlin Kowert & Goetzel P C, September 23, 2003: US06625751 (154 worldwide citation)

A software fault tolerant computer system includes a primary virtual machine and a secondary virtual machine. The secondary virtual machine is operable to replicate the primary virtual machine by replicating operations performed on the primary virtual machine. The primary and the secondary virtual m ...


6
Robert Reid: Central processing apparatus for fault-tolerant computing. Stratus Computer, Lahive & Cockfield, June 5, 1984: US04453215 (143 worldwide citation)

A fault-tolerant computer system provides information transfers between the units of a computing module, including a processor unit and a memory unit and one or more peripheral control units, on a bus structure common to all the units. Information-handling parts of the system, both in the bus struct ...


7
Douglas E Jewett, Tom Bereiter, Brian Vetter: Fault-tolerant computer system with /CONFIG filesystem. Tandem Computers Incorporated, Graham & James, July 5, 1994: US05327553 (142 worldwide citation)

A fault-tolerant computer system employs a pseudo-filesystem to dynamically manage the hardware components. A directory which appears as a standard, hierarchical directory in this filesystem contains a file for each component; each file maps to either a hardware component or a software module. The p ...


8
Robert W Horst: Multiple-processor computer system with asynchronous execution of identical code streams. Tandem Computers Incorporated, Graham & James, May 31, 1994: US05317726 (110 worldwide citation)

A fault-tolerant computer system employs multiple identical CPUs executing the same instruction stream, each with their own independent memory. The multiple CPUs are loosely synchronized, as by counting events such as operating cycles and stalling any CPU ahead of others. Data output references via ...


9
Kenneth T Wolff, Joseph E Samson, Kurt F Baty: Computer peripheral control apparatus. Stratus Computer, Lahive & Cockfield, December 4, 1984: US04486826 (109 worldwide citation)

A fault-tolerant computer system provides information transfers between the units of a computing module, including a processor unit and a memory unit and one or more peripheral control units, on a bus structure common to all the units. Information-handling parts of the system, both in the bus struct ...


10
Fred B Schneider, Butler Lampson, Edward Balkovich, David Thiel: Fault tolerant computer system with shadow virtual processor. Digital Equipment Corporation, Arthur W Fisher, Denis G Maloney, Lindsay G McGuinness, January 30, 1996: US05488716 (107 worldwide citation)

A fault-tolerant computer system has primary and backup computers. Primary and backup virtual machines running on the computers are controlled by corresponding virtual machine monitors. The virtual machines execute only user-mode instructions, while all kernel-mode instructions are trapped and handl ...