== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:37:50 (1788525470)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11124     1260180   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16064     1255240   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32120     3574900   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11484     3595536   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1% /mnt/lustre