major minor  #blocks  name

   8        0  976762584 sda
   8       16  976762584 sdb
   8       17     975872 sdb1
   8       18          1 sdb2
   8       21  975783936 sdb5
 252        0   19529728 dm-0
 252        1    1949696 dm-1
 252        2   10252288 dm-2