== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:42:41 (1788525761)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17892     1253412   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10188     1261116   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       31144     3575792   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12428     3594256   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43572     7170048   1% /mnt/lustre