== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 14:44:05 (1790793845)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11412     1259892   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16020     1255284   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23720     3582880   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19872     3587008   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7169888   1% /mnt/lustre