== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 14:36:08 (1788633368)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11280     1260024   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16128     1255176   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21912     3585108   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21692     3585328   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1% /mnt/lustre