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What raid devices available in config:
cat /etc/mdadm/mdadm.conf

Get details on a raid array:
sudo mdadm --detail /dev/md0
sudo mdadm --detail /dev/md/1

What drives are installed:
sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL

What luks devices setup:
sudo dmsetup status

References:

• View available hard drives in Ubuntu
• Setup full disk encryption on a secondary hdd in linux
• Automatically unlock luks encrypted drives with a keyfile