Do HA enabled always need to be in pairs? For example, if I have 4 node and need more capacity, can I add a 5th node or does it always need to be an even # for HA?
Also, if I am going with 4 large nodes for HA, is it recommended to make 2 node Master-Replica and the other 2 data only, or do you typically allow all the other 3 nodes to be data/replica nodes?
-MattG