$ sudo ./find_rdev /dev/mapper/centos-root
/dev/sda3
/dev/sdb2
$ sudo ./find_rdev /boot
/dev/sda2
$ sudo ./find_rdev /boot
/dev/sda2
$ sudo ./find_rdev /etc/fstab
/dev/sda3
/dev/sdb2
LVM included mdadm device case :
# pvs
PV VG Fmt Attr PSize PFree
/dev/md0 centos lvm2 a-- 15.98g 15.98g
/dev/sda2 centos lvm2 a-- <7.00g 0
/dev/sdb1 centos lvm2 a-- <8.00g 0
$ sudo ./find_rdev /dev/md0
/dev/sdc
/dev/sdd
$ sudo ./find_rdev /
/dev/sda2
/dev/sdb1
/dev/sdc
/dev/sdd