== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:59:08 (1788922748)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17756     1253548   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10432     1260872   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23716     3583304   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19892     3587128   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43608     7170432   1% /mnt/lustre