Can you raid a 90 and 120 ssd together?

Kinda need to be identical for raid 1, 0, 0+1, 10, 5, 6. If you want to set them up as J.B.O.D (Just a Bunch of Discs) they don't need to be identical, what'll happen then is your computer will see it as one 210Gb disc (or whatever your discs add up to). Downside to that is if one disc fails you lose all your data.