== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 03:39:00 (1788853140)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11872     1259432   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16228     1255076   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22712     3584224   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20864     3585792   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43576     7170016   1% /mnt/lustre