== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 19:08:48 (1787612928)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      2209792       13952     2193792   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      2209920       12032     2195840   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3771392       23552     3715072   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       26624     3737600   1% /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7452672   1% /mnt/lustre