== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 07:39:31 (1788521971)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17312     1253992   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116        9696     1261608   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24876     3582144   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18708     3587864   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7170008   1% /mnt/lustre