== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:31:18 (1788575478)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11112     1260192   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15924     1255380   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26816     3580120   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16792     3590200   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170320   1% /mnt/lustre