Am 16.10.19 um 23:01 schrieb Curtis Vaughan:
> Switched out bad hard drive and added a brand new one.
>
> Now I thought I should just run:
>
> sudo mdadm --add /dev/md1 /dev/sda2
> sudo mdadm --add /dev/md1 /dev/sda1
>
> and the raid would be back up and running (RAID1, btw). But I think it
> won't add sda1 or sda2 cause they don't exist. So it seems I need to
> first partition the drive? But how do I partition EXACTLY like the
> other? Or is there another way?
if the disks are *not* GPT it's easy, the script below is from a 4 disk
RAID10 and the exit is there by intention to not call it by accident
[root@srv-rhsoft:~]$ df
Dateisystem Typ Größe Benutzt Verf. Verw% Eingehängt auf
/dev/md1 ext4 29G 7,3G 22G 26% /
/dev/md0 ext4 485M 47M 435M 10% /boot
/dev/md2 ext4 3,6T 1,7T 2,0T 46% /mnt/data
[root@srv-rhsoft:~]$ cat /scripts/raid-recovery.sh
#!/usr/bin/bash
GOOD_DISK="/dev/sda"
BAD_DISK="/dev/sdd"
# --------------------------------------------------------------------------
echo "NOT NOW"
exit
# --------------------------------------------------------------------------
# clone MBR
dd if=$GOOD_DISK of=$BAD_DISK bs=512 count=1
# force OS to read partition tables
partprobe $BAD_DISK
# start RAID recovery
mdadm /dev/md0 --add ${BAD_DISK}1
mdadm /dev/md1 --add ${BAD_DISK}2
mdadm /dev/md2 --add ${BAD_DISK}3
# print RAID status on screen
sleep 5
cat /proc/mdstat
# install bootloader on replacement disk
grub2-install "$BAD_DISK"
