== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 15:00:57 (1788807657)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       12424     1258880   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16956     1254348   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21904     3585116   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21652     3585368   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1% /mnt/lustre