== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 16:04:31 (1788811471)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19812     1251492   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       12616     1258688   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32096     3574924   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11460     3595560   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1% /mnt/lustre