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Oh thanks for the tip! I’ve edited my comment to reflect the minimum of 4 drives for a RAID6 array.
I’ve not used RAID6 for a small array like that before so I didn’t know it had a conventional lower limit. From the technical sense it doesn’t have to have 4 drives, it just wouldn’t make any sense to use it that way so I see why software wouldn’t support such a use case.
I can’t seem to find it, but I think it was James Gosling, where he was blocked from reviewing code at Google because he hadn’t gone through the company’s approval process. I hope this wasn’t a myth I’ve been carrying on for this long.