== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 03:04:02 (1788678242)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17404     1253900   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9924     1261380   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26084     3580936   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       17468     3589552   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1% /mnt/lustre