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TrueNAS Scale ZFS Bottleneck - The Quest For 1000 MB/sec Reads

I'm trying to figure out what could be causing the bottleneck on my NAS. By my calculations I should be able to easily hit over 1000 MB/sec sustained read but I don't know why I'm not. Any useful troubleshooting advice would be appreciated.

System:

OS: TrueNAS-SCALE-22.12.2

CPU: Threadripper 1950X

RAM: 128 GB DDR4

Network: 10 Gbit (Intel X710-DA2 -> Mikrotik CRS317-1G-16S+RM -> AQUANTIA AQC107)

Controller: Adaptec PMC ASR-72405

Drives: 8 Seagate Exos X20

ZFS Pool Config: 2 VDevs (4 drives each) in RAIDZ1

SMB Share Benchmark

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