Four Drives Enter, two Drives ... Well they're fine, read on

Very much like my prior post I've come to turn on the wall mounted server, which is no longer on a wall... only to find the ZFS pool is degraded.  Two drives are AWOL.

They are plugged in, the cables are checked and good, the power is good.... But for two to just vanish is a mystery, they're nice new WD Green SSD's.

And you can see the disks are added to my pool by ID, so it makes no difference which SATA port I plug them into.

I've got six SATA ports on this Motherboard, in three banks of two.  I wondered if the two other banks (as the boot and first mirror in the pool were in the first bank/pair) had gone bad, so many reboots later and checking, no it seems just these two drives are outta there.

I'm going to remove them and come back to this once I have a firm back up of the data.

Here they are.  So I bought these in June, they're marked March 2020.  My plan is, take the data off of the surviving drive in the pool, then sacrifice of of these two to the fdisk gods and see what it does.....  

There we are, that's one of the two in my SATA to USB caddy and... It's fine... Shows itself as very little use, it admittedly is a ZFS formatted drive, but the SMART information is all normal, so I'm thinking....

I'm thinking maybe the PSU on that wall mounted server is doing strange things.  Once moment, I'm going to try that hunch by removing the SATA power from the detected single drive and putting it in the other of these two I have laying here.

YES!... Right, so the disks are good, but the SATA power is on the wonk.  This is a horrid cheap PSU, so maybe time for a replacement.