I always recommend a single large "a" partition for everything on new systems where sizing has not yet been determined. This is pretty typical for new workstation users, but I think that advice holds for new servers as well, if the admin(s) are unfamiliar with the applications being deployed. After things are up and running, repartitioning can be done with some confidence.
Having multiple partitions adds a lot of management value -- once they are sized correctly. Before then, incorrectly sized partitions may cause scheduled downtime for repartitioning and at the very least may add stress.
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