== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 14:54:27 (1788893667)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17192     1254112   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       20240     1251064   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21944     3585076   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23696     3583324   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45640     7168400   1% /mnt/lustre