== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 14:38:53 (1787596733)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17488     1253816   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9840     1261464   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32140     3574488   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11432     3595556   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43572     7170044   1% /mnt/lustre