== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:08:45 (1790953725)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11444     1259860   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16148     1255156   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       31016     3575780   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12560     3594460   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43576     7170240   1% /mnt/lustre