Faulted Pool - now a learning experience I think

[skyman]

I first played with Feeenas in 2012 and had a RAIDz2 pool that worked and then started to fail. I ran out of time to figure out what was going on by myself and while the data in the pool is interesting, it was never essential. I put it away and just sort of uncovered it after a move here in the pandemic. I had to update the motherboard to get more than 4GB memory for updating the software and I've got the drives attached on an updated version of FreeNAS but the pool is in a faulted state.

I'm not hung up on salvaging the pool and the data but I'm looking at this as an opportunity to relearn FreeNAS and ZFS and see what can be done to fix pools when they go south.

As I mentioned, this is not the original mobo or FreeNAS versions.
I'm on an Intel motherboard. DQ87PG, firmware RAID is OFF
Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz
16GB RAM
plus a Vantec UGT-ST622 SATA Card

FreenNAS version: FreeNAS-11.2-U8
---
Here's what the system responds on a "zpool import -Fm"

Code:

root@freenas[~]# zpool import -Fm
   pool: zvol
     id: 16463217584233552827
  state: FAULTED
status: The pool was last accessed by another system.
action: The pool cannot be imported due to damaged devices or data.
        The pool may be active on another system, but can be imported using
        the '-f' flag.
   see: http://illumos.org/msg/ZFS-8000-EY
config:

        zvol                                              FAULTED  corrupted data
          raidz2-0                                        FAULTED  corrupted data
            replacing-0                                   DEGRADED
              3611969563623941027                         UNAVAIL  cannot open
              gptid/182efe0b-edc4-11e1-89f0-0019d1b19ccc  ONLINE
            gpt/disk1                                     ONLINE
            gpt/disk2                                     ONLINE
            15007851137920280294                          UNAVAIL  cannot open
            gpt/disk4                                     ONLINE
            gpt/disk5                                     ONLINE
            gpt/disk6                                     ONLINE
        spares
          gptid/090d9d92-aa3c-11e0-8dcc-0019d1b19ccc
root@freenas[~]#

At this point, I'm asking for help in learning.

What is this telling me? Did I misconnect the drives? Am I missing a drive that should be in the pool. Since it's z2, could it ignore the degraded/unavail disks and mount read-only?

I'm planning to eventually wipe and restart, but in the meantime I see this as an opportunity to understand this space a little better, practice recovery, just learn.

Anyone got some knowledge to drop?