== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:34:34 (1787592874)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13304     1258000   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18280     1253024   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       20672     3586348   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22884     3584136   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1% /mnt/lustre