== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 12:52:47 (1786035167)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11156     1260148   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16264     1255040   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22832     3584076   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20772     3586192   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170268   1%  /mnt/lustre