== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 12:27:31 (1788539251)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11428     1259876   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16300     1255004   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20704     3586148   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22916     3583656   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43620     7169804   1% /mnt/lustre