== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 06:07:38 (1788775658)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19480     1251824   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11880     1259424   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24112     3582880   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19492     3587528   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170408   1% /mnt/lustre