[Help] Expansion Greyed out on Storage Pool F4-423

[pigwalkarg]

Hello there! Have a F4-423, started off with 2 12tb drives in TRAID. I've started migrating my data, they're fully synced and now I'm ready to start expanding. I have a 8tb in the NAS, it's detected and I can add it to my Storage Pool 1 (nvme system storage) but expansion is greyed out on Storage Pool 2 which has both the existing 12tb drives. Everything is fully up to date. What could be the issue?

[Gremlin]

Presume 8TB is HDD ? Best not to add HDD to nvme raid.
Otherwise, I suspect the inability to add to Pool2 is the size. Generally speaking, expanding a raid array requires new drives of equal or greater size. In Traid, if there are different size drives, the larger is usually allocated to the "parity" (using the term loosely) drive. With 2x12TB in effectively a raid1, (1 data, 1 mirror) the system probably does not like the idea. (Just guessing at this point since I have never tried this process.)

[pigwalkarg]

So on creation, mis matched drives aren't an issue? But for addition, any new drives need to be larger than any existing member, is that correct? That would explain it. I'll try doing some data juggling and start the TRAID with the 2 8tb drives, and then add the 2 12tb drives as I can get data moved around.