Question Speed Issue

[Clonus]

Hi everyone, I came here to hopefully get some insight.

I have a DL360 G7
https://support.hpe.com/hpesc/public/docDisplay?docId=emr_na-c02206943

I recently purchased a USB 3.1 PCIe card from Amazon.
StarTech.com Dual Port USB 3.1 Card – 2X USB-A – 10Gbps per Port – Expansion Card – PCI Express USB Card – PCI-e to USB (PEXUSB312A2)

I purchased 2x4 GB Seagate HardDrives and I put them on RAID 1 in this thing
TerraMaster D2-310 USB Type C External Hard Drive RAID Enclosure USB3.1 (10Gbps) 2-Bay RAID Storage

I have the DL360 on VMWare ESXi 6.7.0

The PCIe card is set up as a passthrough device. It registers as an "ASMEdia Technology Inc. USB Controller"

There is an Ubuntu VM using this PCIe card, when I benchmark the drive I am getting average 132.9 BM/s read (100 samples) and 114.6 MB/s write (100 samples)

The StarTech card is in the "Slot 2" location and the user manual states
Slot 2 PCIe2 x16 (16, 8, 4, 2, 1), 75W +EXT 75W*

This seems a bit slow to me, any thoughts here, please?

Thank you.

 

[Clonus]

Something to add, I believe I've seen benchmarks around 180 MB/s. Do you think the RAID 1 overhead is causing this drop in performance?