pokud mountuje pomocí UUID, tak to není nutné, ale je nutné zavádět os z toho správného disku...
$ cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sda3 during installation
UUID=28ad4700-bd80-4768-9c1e-a6628445ea90 / btrfs defaults,subvol=@ 0 1
# /boot was on /dev/sda1 during installation
UUID=2c06e872-a9b6-4ed3-9a2c-e81bd0829618 /boot ext2 defaults 0 2
# /home was on /dev/sda3 during installation
UUID=28ad4700-bd80-4768-9c1e-a6628445ea90 /home btrfs defaults,subvol=@home 0 2
# swap was on /dev/sda2 during installation
UUID=09fe61ff-a8ad-45ee-a874-52ad88e1f8a7 none swap sw 0 0