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Add notes on Penta SATA HAT.
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geerlingguy committed Mar 29, 2024
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Expand Up @@ -12,4 +12,13 @@ This HAT includes four SATA drive connectors, plus one edge connector for a 5th

There's also an 'Expansion interface' with connections for OLED and Fan control, but there is no included adapter for such purposes. So you'd probably want to connect a little fan to the Pi's fan header for the Pi itself, or a USB fan for the drives, if needed.

It looks like the SATA controller is a JMB585 PCIe Gen 3x2 SATA controller, so it could benefit from running the Pi 5's PCIe lane at Gen 3.0 speeds (setting dtparam=pciex1_gen=3 in /boot/firmware/config.txt).
It looks like the SATA controller is a JMB585 PCIe Gen 3x2 SATA controller, so it benefits from running the Pi 5's PCIe lane at Gen 3.0 speeds.

To use the board at Gen 3.0 speeds, after connecting it to the Pi, you need to add the following lines to `/boot/firmware/config.txt`:

```
dtparam=pciex1
dtparam=pciex1_gen=3
```

I was able to get sequential read speeds around 800-850 MB/sec with an array of four Samsung QVO SSDs set up in RAID 0.

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