When testing RAID with mdadm, you may need to completely reset the array before reuse.

Reset Procedure

1. Check current status:

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lsblk -o NAME,SIZE,FSTYPE,TYPE,MOUNTPOINT

2. If mounted, unmount first:

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umount /mnt/md0

3. Stop RAID device:

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sudo mdadm --stop /dev/md0

4. Zero superblock on each member disk:

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sudo mdadm --zero-superblock /dev/nvme0n1
sudo mdadm --zero-superblock /dev/nvme1n1

5. Review whether configuration files also need cleanup:

• /etc/mdadm/mdadm.conf
• /etc/fstab