Jeff Geerling

Pogo power pins: 

Testing with an mdadm RAID0 array of all four drives, to get a feel for the performance without ZFS caching in front (with ZFS, the numbers are all amazing, over...

RAID 5 results: ``` | Benchmark | Result | | -------------------------- | ------ | | iozone 4K random read | 48.21 MB/s | | iozone 4K random write | 71.84...

It's on the site now: https://pipci.jeffgeerling.com/hats/radxa-penta-sata-hat.html I'll be testing and benchmarking soon!

Some usage notes: - I had to add `dtparam=pciex1` to the `/boot/firmware/config.txt` to get the HAT to be recognized - I also could run it at PCIe Gen 3.0 speeds...

One concern could be heating—the JMB585 SATA controller chip hit peaks of 60+°C in my testing:  There is an official fan/OLED board, and that seems like it would be...

And here's an illustration of the three heatsink fins I had to break off to get the HAT to fit: 

I've also been monitoring IRQs and CPU affinity while doing network copies—the writes, specifically—and nothing really jumps out and suggests a bottleneck there (I'm reminded of [this old Raspberry Pi...

Monitoring the CPU frequency with `vcgencmd measure_clock arm`, I do see it dipping down now and then, but mostly staying stable at 2.4 GHz (`frequency(0)=2400033792`). I will try `performance` and...

I also tried NFS instead of Samba, by enabling it, creating a share 'shared', and connecting via Finder at `nfs://10.0.2.214/export/shared` (I had to glance on the Pi what the exports...