How to delete an mdadm RAID Array
Deleting a software RAID array will result in all data stored in the devices being lost. So be careful when you remove a RAID array, take backups in case needed.
Before you can remove the software RAID array, you need to unmount it.
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umount /dev/mdX |
Where /dev/mdX is the device name for the RAID device you need to remove.
Find the disk used to create the RAID with the command
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mdadm --detail /dev/mdX |
Stop the RAID device with the command
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mdadm --stop /dev/mdX |
Now you need to run the following commands for each storage device that are part of the RAID device.
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mdadm --zero-superblock /dev/sdXY |
IMPORTANT: you need to run this for each member of the RAID device.
Finally edit /etc/mdadm/mdadm.conf, remove the entry for the RAID array.