Completely removing a mdadm raid array in Ubuntu

To completely remove an mdadm raid array you must “zero the superblock” on the component drives, so that mdadm will not detect them on its next scan/reboot of your system:

sudo bash
mdadm --stop /dev/md1
mdadm --remove /dev/md1
mdadm --zero-superblock /dev/sdb3
mdadm --zero-superblock /dev/sdc3

Oh…and happy new year!

With thanks to MDLog:/sysadmin.

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