[gorkish]

The internal AXI bus on the Pi SoC can only move data at ~4gbps by DMA, so no the Pi 4 simply cannot cannot round trip real data from disk to network any faster than about 2gbps. It can saturate a 2.5gbps nic with a synthetic datastream, but for a storage application the 1gbps interface is as much as a single pi is going to realistically be capable of