== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 20:46:43 (1789087603)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11132     1260172   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15996     1255308   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24096     3582644   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19508     3587484   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170128   1%  /mnt/lustre