On 20/07/16 16:36, Wols Lists wrote: > Get that first 3TB drive. NOW. Physically replace sda in the machine, > and configure it as a single-drive mirror ( --create --devices=2 sda > spare). Just noticed your edu address. If Phil Turmel chimes in, he'll tell me off for telling you to spend money :-) If you are an impecunious student, and your data will fit on 2TB, then beg borrow or steal :-) a 2TB drive. Use that as your backup, mirrored, as I said, and then you can combine the two constellations into a 2TB raid0, and add that in as the second half of your mirror. That will at least give you a working, safe, raid system. Cheers, Wol -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html