== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 02:35:48 (1788849348)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11100     1260204   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16084     1255220   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28160     3578860   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15428     3591396   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43588     7170256   1% /mnt/lustre