== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 04:14:56 (1788855296)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13196     1258108   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18116     1253188   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32152     3574644   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11452     3595428   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170072   1% /mnt/lustre