== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:31:54 (1787844714)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11504     1259800   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16120     1255184   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       31032     3575848   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12560     3594320   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7170168   1%  /mnt/lustre