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this post was submitted on 21 Aug 2023
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Not an expert, but as far as I know running with mismatched drives isn't bad - it's just a pointless long-term configuration.
Are you planning on mirroring the drives? If you upgrade to 4 drives in the future you could just do 2 mirror vdevs with mismatched drive sizes per vdev. Also I'm surprised you're bothering with 6TB drives - you can get 14TB very cheap nowadays (recertified).
I looked at doing two vdevs but was put off by the lower usable storage. At a certain point, maybe that's not as important as I think though.
Yeah, the choice for 6TB wasn't my best. I got the two older drives a few years back on a Newegg flash sale, and it seemed like plenty, especially considering Unraid's model of 1 parity drive and 100% usable storage on the data drive(s). Then, when I decided to upgrade, I was too cheap to go buy 4 whole new drives, so I just went with more of what I already had (to add insult to injury, they're all WD Red drives...).
Yeah lower usable storage sucks, but it's an okay trade at the moment given its flexibility. raidz expansion is always "right around the corner" but never actually arrives - if it's merged a raidz array might make more sense for a smaller NAS.
Personally I've found that if you're really budget-conscious or have a low number of disks, MergerFS+SnapRAID backed by BTRFS disks is a better choice for flexibility (very similar to an Unraid setup), since you can add/remove at any time, and they can be mismatched drive sizes.