replace failure disk and rebuild RAID with mdadm
One of my 4 RAID disks is failed. I want to replace it with a brand new drive which i has just format it.
using mdadm --assumble /dev/md0 /dev/sdb
It saidmy sdb3 (new drive) has no superblock.
so I try
mdadm --add /dev/md0 /dev/sdb3
It does not work either.
Does anyone know how to add the drive?