== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 02:26:49 (1788762409)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17604     1253700   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9824     1261480   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20812     3586208   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22796     3584224   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170432   1% /mnt/lustre