== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 14:40:21 (1788892821)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      2210304        9856     2198400   1% /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       24576     3734528   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       24576     3744768   1% /mnt/lustre[OST:1] 

filesystem_summary:      7542784       49152     7479296   1% /mnt/lustre