== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:02:48 (1788879768)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       18124     1253180   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       21536     1249768   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21132     3585888   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23536     3583484   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44668     7169372   1% /mnt/lustre