Comment by greenavocado
4 hours ago
As I pointed out in another post if you are using ZFS RAID Z2 you can use literal used garbage hard drives safely without risking data loss.
ZFS helped me discover that my motherboard SATA chip can't handle 6 drives; I had to purchase a cheap Chinese PCI Express SATA controller to communicate with my drives reliably and error-free.
Not for special VDEVs, which is the explicit purpose here.
You can mirror a slog... l2arc doesn't need a mirror because the data is already on disk. I believe a split metadata can also be mirrored.
That's correct. I ran a special metadata VDEV 3-way mirror using this NVMe PLX card for a while https://imgur.com/a/xiwzkA6
You can dump any vdev you want in a special. I have 2x 3 way mirrors in both of my nas boxes right now
I'd be more worried about a supply chain attack with malicious devices.
What kind of supply chain attack can one mount with a disk?
A malicious device plugged into your machine? The only limit is your imagination.