== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:58:34 (1787576314)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13568     1257736   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18040     1253264   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30768     3575748   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12828     3594080   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43596     7169828   1% /mnt/lustre