== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 04:58:45 (1787561925)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19636     1251668   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       12308     1258996   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23924     3582984   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19680     3587032   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170016   1% /mnt/lustre