== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 01:59:21 (1789451961)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13132     1258172   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18088     1253216   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23692     3583328   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19888     3586684   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43580     7170012   1% /mnt/lustre