== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 23:10:46 (1788664246)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17480     1253824   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10036     1261268   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24676     3581952   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18880     3588000   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7169952   1% /mnt/lustre