== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:40:55 (1789648855)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19496     1251808   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11976     1259328   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20928     3585644   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22628     3584224   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7169868   1% /mnt/lustre