== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 15:16:48 (1784229408)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2209536       10880     2196608   1%  /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       24576     3734528   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       26624     3738624   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7542784       51200     7473152   1%  /mnt/lustre