== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:04:51 (1786759491)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19416     1251888   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11780     1259524   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30916     3575964   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12688     3594248   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170212   1%  /mnt/lustre