== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 02:00:52 (1788847252)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11632     1259672   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16416     1254888   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24668     3582184   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18912     3587688   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43580     7169872   1% /mnt/lustre