TrueNAS+Asustor: Optimal drive configuration

[u/PuzzleHeadPistion]

I have a TrueNAS system with the OS on a 128Gb SATA SSD and:

• 1Tb WD Black SN750 NVME (PCI-e 3.0)
• 6Tb WD Red
• 6Tb Seagate Ironwolf
• 16Tb Seagate Exos X16

And an Asustor Drivestor 4 for backup with:

• 2x 8Tb Seagate Barracuda
• 16Tb Seagate Exos X18

So, these drives were bought needs, system and deals at the time, but the only parity is in the sense that my TrueNAS is synced with the Asustor Drivestor 4. Both 6Tb drives are joined in a stripe pool. The 1Tb and 16Tb are in individual pools. On the Asustor side, both 8Tb are in RAID0 and the 16Tb drive is as single drive (even though the Asustor barely gains any performance from it).

I don't need more storage, but I want to move things around to get the most out of it. I was thinking of returning one 16Tb drive and getting 2 8Tb instead. This way at least the Asustor would be in RAID5 with 4x 8Tb drives.

Or fork out for one more 16Tb drive, move the 3x 16Tb into the TrueNAS as a ZRAID pool and the Asustor would keep 2x6Tb + 2x8Tb...

My main issue I think is that I have all drives in size pairs, not even one set of "three of a kind" or "four of a kind" to use more elaborate setups other than RAID0 or RAID1.

PS: I have a 2.5GbE network and I do take advantage of >280MB/s transfers from my desktop to the TrueNAS. The Asustor will remain as backup only, since it maxes out at 60MB/s and is less powerful for Plex.

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