== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:24:01 (1788747841)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17548     1253756   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10148     1261156   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20928     3585980   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22668     3584072   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43596     7170052   1% /mnt/lustre