Today I added a 5th drive in my array, I did the following:
mdadm --add /dev/md0 /dev/sdf1
My drive was added as a spare, I then did:
mdadm --grow /dev/md0 --raid-devices=5
But when I want to check the progress with
watch cat /proc/mdstat
it gets stuck and I can't see what's going on. Meanwhile, I can't access the data wich I assume or hope is normal. Any ideas?