== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 06:49:10 (1734436150)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       18720     1268968   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24564     1263124   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116      548996     3058024  16% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116      527644     3079376  15% /mnt/lustre[OST:1]

filesystem_summary:      7666232     1076640     6137400  15% /mnt/lustre