If you don't mind me asking, what kind of workload requires this kind of "high-availability shenanigans". Sounds fascinating.
Apparently there are some workloads in finance that use similar hardware.
Not surprising, I've heard from someone who worked at a financial institution doing high-speed trading that basically every ms counts for them.
- you have a human in the loop to take a split second decision, every millisecond counts
- you have a very short time to perform 'looped' operations - where the result of one measurement must be taken into account to effect the next measurement (adaptive optics, some radar systems, some mechanical control loops) and you can't wait.
You'd think 'oh but you got more than 1 ms for that' Well not always since one must take into account the time to detect the failure, and the time to switch other parts of the system (which sometimes must be done in sequence with the connection takeover).
I'd say 'forget tcp' there but we don't always get to decide the comm layer...
If the window of unavailability was instead 1ms, there would be dramatically less noise, potentially none.