So I have a Blue ring MWBE withs 2 500 GB drives. They were set up as a Raid 1.
I noticed that one of the drives had failed, so I replaced it.
After creating the appropriate partitions using FDisk (made it so it matched the healthy disk exactly), I added the new disk to the raid using mdadm.
The small partitions synced up quite quickly - I knew that md4 was going to take a while.
Problem is that it doesn't seem to be moving at all.
The occasional "cat /proc/mdstat" shows 0.0% complete. The numbers in the brackets seems to creep up, and then be back at the start if I check again later.
I umounted /dev/md4 assuming that it would help things (preventing disk access), but it doesn't seem to have changed much.
Anything I'm doing wrong? Or any suggestions I could try?