== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 01:24:54 (1789277094)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13216     1258088   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18208     1253096   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22572     3583972   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20980     3586040   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170012   1% /mnt/lustre