[root@yz219 blkio]# cat /proc/partitions
major minor  #blocks  name

   8        0  209715200 sda
   8        1    1048576 sda1
   8        2  208665600 sda2
  11        0    4391936 sr0
 253        0   52428800 dm-0
 253        1    5111808 dm-1
 253        2  151117824 dm-2