== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 12:38:28 (1788539908)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11104     1260200   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15940     1255364   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26020     3580636   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17568     3589396   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43588     7170032   1% /mnt/lustre