I was recently answering a question on Super User about RAID. In this context RAID means "redundant array of independent (or inexpensive) disks". I wanted to point out to fellow user that he should make sure that computer is set to boot from the array.
I used syntagma "RAID set" but I'm not sure if it fits. I felt that the best way to say what I wanted would be to use "RAID array" but then we have the array array problem.
I've seen that the automated teller machine machine problem is solved by simply dropping the second machine, but here I also had RAID card so using just RAID wouldn't work and I wanted to avoid just saying array because I think that it's unlikely that any of the settings which would need to be changed would contain RAID in its expanded form.