I have had a setup with 2 pools in my Truenas Scale, one with 2 16tb drives in a single parity (think that’s what it’s called) and the other pool has 4 drives with no parity at all. I no longer need the pool that had the 2 16tb drives, and would like to get them setup all in 1 pool, but don’t know what parity. I would like for 1 of the 2 16tb drives to be the parity, while the other drives are the actual storage. I need help knowing what configuration to put them in for that, would be a great help please!
i should also note that the 4 drives in the other pool are all different drives. I know that’s frowned upon, but nothing on the drive is crucial data, mostly just Plex and files i use across all my PC’s in my house, and all those are stored on other sources as well.
Take a look at TrueNAS Comprehensive Solution Brief and Guides
Read it all the way to the end, then go back and read it again. ZFS lays out zpools very differently than any other RAID system. Get yourself a basic understanding of the way ZFS does things before you decide upon a layout and before you start getting advice here 
The advice you get here is based on our individual experiences, yours will be different.
2 Likes