== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 15:49:08 (1790884148)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       21596     1249708   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15656     1255648   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25800     3581220   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19828     3587192   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45628     7168412   1% /mnt/lustre