== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 05:53:36 (1787738016)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      2209920       14208     2193664   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      2209920       12416     2195456   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3771392       28672     3740672   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       21504     3747840   1% /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7488512   1% /mnt/lustre