Two controllers, if they are truly ustilizing multi-pathing, would actually act in parallel and would be more reliable. R = 1-(1-R)^n so to the extent they are completely seperate ( which nothing ever truly is) they would approximate R=.9999!
I can see a lot of advantages in multicore processors like these. I wonder though about the fault tolerance for a device that uses two cores and compares the results? I would think 3 cores and voting the odd one out might be slightly more expensive but better. Along those same lines the fault tolerance and ability to function in a degraded state might be really useful as well. Sensor failure or errors related to the sensors need to be accommodated as well in a fault tolerant manner.
I am a bit leary of simply adding in more redundancy. That can also lead to more failures. Correct me if I am wrong but 2 controllers with 99% reliability each when coupled are they not then 98% reliable?
In general I learned it was better to design systems with greater reliability, test it and prove it historically in production. Then only add additional redundancy if it was really required. Some systems required redundancy as a matter of course in terms of availability for maintenance and mission critical applications. Perhaps others can weigh in on this and explain this subject a little better.
I suppose part of this is the diffference between redundant and backup components? When I served on US Navy ships we had three steam driven turbogenerators for redundancy and a diesel generator for backup. But we had only one main engine. I know the costs figure into this as well as they always do.
Using wireless chips and accessories, engineers can now extract data from the unlikeliest of places -- pumps, motors, bridges, conveyors, refineries, cooling towers, parking garages, down-hole drills and just about anything else that can benefit from monitoring.
With strong marketplace demand for qualified engineers across the board that currently outstrips the available supply, there may never be a better time for engineers and project managers to advance their careers and salaries. Whether those moves are successful in the short-term and long-term is likely to depend on how the transition from one job to the next is handled.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.