== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 18:39:37 (1789511977)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11184     1260120   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15936     1255368   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24996     3581660   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18580     3588356   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43576     7170016   1% /mnt/lustre