invalid raid superblock

https://ubuntuforums.org/showthread.php?t=900406

mount: unknown filesystem type ‘LVM2_member’

https://blog.sleeplessbeastie.eu/2012/05/08/how-to-mount-software-raid1-member-using-mdadm/

https://www.nas-forum.com/forum/topic/57264-raid-shr-hs/