== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:45:57 (1787575557)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11140     1260164   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16108     1255196   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29132     3577860   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14476     3592544   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170404   1% /mnt/lustre