Cursory review only (others may see more): I see one disk with major issues "/dev/ada2" (The Seagate HD). That sucker is hurting for sure...
I would suggest that you:
- Power down
- Double, triple check your cables (SATA and PW)
- Replace the ones for the Seagate and that other missing drive (if possible)
- Power On, but opt to enter the BIOS
- This is just so that you can check to see if the drives are detected by the system before booting FreeNas
- If you have a HBA with the BIOS installed it should show you which drives are detected during the process
- Note: You can hit the [Pause] button on your KB to stop it from flying by too fast to read (Hit [Enter] to resume)
- If you are connecting the drives directly to the MB, then look in there to check if it sees all the disks
- Basically if your system can't see the drives then neither will FreeNas
My concern is that while it sees 5 of the 6 drives (albeit one is on its deathbed), it should still function (since you have RaidZ2).
As far as the hard drive connections, all I was asking is if they are directly connected to the Motherboard or if they are connected to an HBA (or other card). If so, what is the make/model of the card?