1. A fault-tolerant server comprising: (a) a communications link; (b) a first computing element in electrical communication with the communications link, the first computing element providing a first instruction to the communications link; (c) a second computing element in electrical communication with the communications link, the second computing element providing a second instruction to the communications link; (d) a first local input-output (I/O) subsystem in electrical communication with the first computing element and the communications link; and (e) a second local I/O subsystem in electrical communication with the second computing element and the communications link, wherein at least one of the first local I/O subsystem and the second local I/O subsystem compares the first instruction and the second instruction and indicates a fault of at least one of the first computing element and the second computing element upon the detection of a miscompare of the first instruction and the second instruction.