== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 12:40:26 (1787157626)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11012     1260292   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15852     1255452   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23880     3583112   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19724     3587296   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170408   1%  /mnt/lustre