And illustrating the previous point (root filesystem on single-path device):
(initramfs) cat /proc/cmdline BOOT_IMAGE=/boot/vmlinux-3.19.0-8-generic root=UUID=3809b2f8-dcb0-4a6a-945a-885e384b463e ro break=post-multipath
(initramfs) ls -l /dev/disk/by-uuid ... lrwxrwxrwx 1 10 3809b2f8-dcb0-4a6a-945a-885e384b463e -> ../../sda2 ... (initramfs) multipath -v0 ... (initramfs) ls -l /dev/disk/by-uuid ... lrwxrwxrwx 1 10 3809b2f8-dcb0-4a6a-945a-885e384b463e -> ../../dm-2 ...
And illustrating the previous point (root filesystem on single-path device):
(initramfs) cat /proc/cmdline /boot/vmlinux- 3.19.0- 8-generic root=UUID= 3809b2f8- dcb0-4a6a- 945a-885e384b46 3e ro break=post- multipath
BOOT_IMAGE=
(initramfs) ls -l /dev/disk/by-uuid dcb0-4a6a- 945a-885e384b46 3e -> ../../sda2 dcb0-4a6a- 945a-885e384b46 3e -> ../../dm-2
...
lrwxrwxrwx 1 10 3809b2f8-
...
(initramfs) multipath -v0
...
(initramfs) ls -l /dev/disk/by-uuid
...
lrwxrwxrwx 1 10 3809b2f8-
...