Resetting mdadm RAID on Ubuntu 22.04

Reset Procedure

Stop the RAID array first:

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sudo mdadm --stop /dev/md0

Clear the superblock information from the member disks. Replace the device names with the disks that actually belong to your array:

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sudo mdadm --zero-superblock /dev/sdb
sudo mdadm --zero-superblock /dev/sdc

If the disks were previously partitioned or still contain old filesystem signatures, wipe the signatures as well:

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sudo wipefs -a /dev/sdb
sudo wipefs -a /dev/sdc

Reload partition information and check the current block devices:

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sudo partprobe
lsblk
cat /proc/mdstat

After confirming that no old array is active, create the RAID array again according to the desired level and disk list:

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sudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc

Finally, save the new array configuration:

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sudo mdadm --detail --scan | sudo tee -a /etc/mdadm/mdadm.conf
sudo update-initramfs -u

Before running destructive commands such as --zero-superblock or wipefs -a, verify the disk names carefully. These commands remove RAID or filesystem metadata and can make existing data inaccessible.