== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:32:05 (1788881525)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       18860     1252444   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       22164     1249140   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       31096     3575924   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14524     3592496   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45620     7168420   1% /mnt/lustre