== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 05:27:02 (1790933222)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11624     1259680   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16408     1254896   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22696     3584324   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20892     3585652   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43588     7169976   1% /mnt/lustre