== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 09:11:13 (1789391473)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13508     1257796   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18108     1253196   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21876     3585144   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21680     3585340   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1% /mnt/lustre