# ---
# - Rename /dev/md126 to /devmd2
# ---

mdadm --stop /dev/md126
mdadm --assemble --update=name --name=<HOSTNAME>:2 /dev/md2 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1

# - Take care /etc/mdadm/mdadm.conf is up-to-date
# -
mdadm --examine --scan --config=mdadm.conf

# - Make the changes known to initramfs
# -
update-initramfs -u -k all