== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 21:17:26 (1781227046)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19292     1252012   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11848     1259456   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20700     3586320   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22904     3584116   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1%  /mnt/lustre