I've got a Raid 5, which originally was 3 x 2TB disks - One disk failed, so I replaced it with a 4TB thinking thinking that at some stage I could upgrade the others to give me more space. I bought a couple of new disks about 6 months ago so thought about time to upgrade another disk, then after rebuild the last disk and then grow it. Problem is, if I just rip out the disk then the raid management then shows nothing at all, so I can't rebuild or do anything? After some advise - Current detail of raid below:-
Code
Number Major Minor RaidDevice State
0 8 16 0 active sync /dev/sdb
3 8 32 1 active sync /dev/sdc
2 8 48 2 active sync /dev/sdd