== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:53:35 (1789613615)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11456     1259848   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16144     1255160   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21896     3584984   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21712     3585140   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170124   1% /mnt/lustre