Patent ID: 7114095

Claim:
A multiple processor computer system comprising: two processors having a first processor and a second processor, the two processors configured to operate in a multiprocessing mode, wherein the two processors operate in parallel with each other, and a fail-over processing mode, wherein the first processor takes over an operation of the second processor in an event of a failure of the second processor; at least one operating system executed by the two processors, wherein the at least one operating system is configured to support multiprocessing in the multiprocessing mode, to support fail-over processing in the fail-over processing mode, and to facilitate switching between multiprocessing and fail-over processing; and at least one changeable reliability mechanism that includes at least one of a reliability mechanism operable to be activated; a reliability mechanism operable to be deactivated; an exception handler operable to be changed; a system integrity verifier operable to be activated; a system integrity handler operable to be deactivated; a software redundancy model operable to begin; and a software redundancy model operable to stop.