== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 23:04:09 (1789527849)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       23012     1248292   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17604     1253700   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32096     3574924   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13388     3593632   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45484     7168556   1% /mnt/lustre