== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 16:22:52 (1730578972)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       18496     1269192   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24464     1263224   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      539876     3067144  15% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      536768     3070252  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1076644     6137396  15% /mnt/lustre