== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 17:38:46 (1788212326)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19236     1252068   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11876     1259428   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29836     3577072   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13744     3593052   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43580     7170124   1% /mnt/lustre