mdadm/README.rename-array

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# ---
# - Rename /dev/md126 to /devmd2
# ---
# Check which devices are involved in the /dev/md5 array
#
cat /proc/mdstat
unount /dev/md126
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
# -
# - Adjust /etc/mdadm/mdadm.conf if needed
# -
mdadm --examine --scan
# - Make the changes known to initramfs
# -
update-initramfs -u -k all