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→Dual Modular Redundancy: No need to be capitalized |
→Triple Modular Redundancy: Same thing |
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While either the lockstep or the DMR approach (when combined with some means of detecting errors in the master) can provide redundancy against hardware failure in the master, they do not protect against software failure. If the master fails because of a software error, it is highly likely that the slave - in attempting to repeat the execution of the step which failed - will simply repeat the same error and fail in the same way, an example of a [[common mode failure]].
== Triple
{{Main|Triple modular redundancy}}
Where the computing systems are triplicated, it becomes possible to treat them as "voting" systems. If one unit's output disagrees with the other two, it is detected as having failed. The matched output from the other two is treated as correct.
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