== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:23:09 (1790734989)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      2209920       14080     2193792   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      2210048       12032     2195968   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3771392       28672     3740672   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       21504     3719168   1% /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7459840   1% /mnt/lustre