Update Mdadm Conf

To update /etc/mdadm/mdadm.conf after changing the RAID layout, I use the following code snippet:

 (
     echo DEVICE partitions
     mdadm --examine --scan \
         | sed -n \
             -eN \
             -e's/\n *devices=\(\/dev\/.d[a-z][0-9].*\)$/  # \1/' \
             -eT \
             -ep \
         | sort
 ) >mdadm.conf.new

This script will convert the mdadm --examine --scan output into an mdadm.conf file. It will remove any explicit device name and keep only this raid devices which are based on harddisk partitions.