== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:02:45 (1787583765)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       12928     1258376   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18036     1253268   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29004     3577932   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14588     3592012   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7169944   1% /mnt/lustre