== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 17:57:53 (1788731873)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19696     1251608   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       22764     1248540   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21940     3585080   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23700     3583320   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45640     7168400   1% /mnt/lustre