== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 10:24:57 (1788877497)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      2210048       11648     2196352   1% /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       24576     3741696   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       25600     3732480   1% /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7474176   1% /mnt/lustre