== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 18:35:46 (1787783746)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13416     1257888   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18164     1253140   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24068     3582952   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19488     3587532   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1% /mnt/lustre