== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 19:30:09 (1788651009)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13164     1258140   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17832     1253472   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20916     3586048   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22688     3584304   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170352   1% /mnt/lustre