== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:07:44 (1788574064)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17652     1253652   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9904     1261400   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28760     3578260   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14796     3591776   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170036   1% /mnt/lustre