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There is only ever one active IP replication link per "Port Group". So if you have two 8 node clusters, and each node has a "remote copy" IP address - the code will be picking one of the 64 possible connections and using it.
I think we did increase the number of ports you could configure - but the number of active ports is still one per port group.
You are only supposed to the second port group if there are two independent ethernet networks connecting the two clusters. In that case there will be two active connections.
So I think we allowed a lot more IP addresses to be configured - but we didn't really make any changes to how it worked.
The Mathis Equation states that the maximum throughput achieved by a TCP connection can be calculated by dividing MSS by RTT and multiplying the result by 1 over the square root of p, where p represents the packet loss, and MSS is the maximum segment size.If you apply that theory to compare a 10Gb link and a 1Gb link, with the same amount of packet loss and the same segment size, you will see that the achievable throughput of a 10Gb link drops dramatically at a lower RTT than for a 1Gb connection (for which the drop of throughput appears at a higher RTT). I'd say that is why we support a higher RTT on a 1Gb link (80ms vs. 10ms).Note: with FC protocol, we could consider there is no packet loss. Therefore, the achievable throughput is constant even over a long distance (or high RTT).Erwan Auffret