== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 21:54:19 (1788573259)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19320     1251984   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11968     1259336   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22868     3583732   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20688     3586332   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170064   1% /mnt/lustre