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seen Sep 11 '14 at 11:58

comment Linux RAID1 with only One disk
I found this answer useful in a situation where I started with one RAID1 partition and later added another partition. This is how you create a single-component RAID1: mdadm --create /dev/md0 --level=1 --force --raid-devices=1 --metadata 1.2 /dev/sdd1