== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 22:23:14 (1746152594)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       20132     1267556   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       18216     1269472   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       22596     3584424   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       20572     3586448   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       43168     7170872   1% /mnt/lustre