To test if my 3 HDDs can survive a RAID1 rebuild, I'm doing 3 rebuilds like this:
B A B -> C A <- C A -> B
(I'm at the last step right now)
But my NAS only has two HDD slots so I had to shuffle the disks 3 times. And oh boy was it hard to keep track of which drive is which, and how many rebuilds I've already done. The drives look all the same, they have the same content, and they're all referred to as sda or sdb depending on which slot they're in.