$ ls -l /dev/sd[ab][123] /dev/mapper/sd[ab][123]
brw-rw---- 1 root disk 238,  0 2007-04-25 15:00 /dev/mapper/sda1
brw-rw---- 1 root disk 238,  2 2007-04-25 15:00 /dev/mapper/sda2
brw-rw---- 1 root disk 238,  4 2007-04-25 15:00 /dev/mapper/sda3
brw-rw---- 1 root disk 238,  1 2007-04-25 15:00 /dev/mapper/sdb1
brw-rw---- 1 root disk 238,  3 2007-04-25 15:00 /dev/mapper/sdb2
brw-rw---- 1 root disk 238,  5 2007-04-25 15:00 /dev/mapper/sdb3
brw-rw---- 1 root disk   8,  1 2007-04-25 15:00 /dev/sda1
brw-rw---- 1 root disk   8,  2 2007-04-25 15:00 /dev/sda2
brw-rw---- 1 root disk   8,  3 2007-04-25 15:00 /dev/sda3
brw-rw---- 1 root disk   8, 17 2007-04-25 15:00 /dev/sdb1
brw-rw---- 1 root disk   8, 18 2007-04-25 15:00 /dev/sdb2
brw-rw---- 1 root disk   8, 19 2007-04-25 15:00 /dev/sdb3