== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 17:47:50 (1788472070)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      2210048        7552     2200448   1% /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       22528     3720192   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       25600     3743744   1% /mnt/lustre[OST:1] 

filesystem_summary:      7542784       48128     7463936   1% /mnt/lustre