== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 02:59:36 (1746082776)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       15672     1272016   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21072     1266616   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       24880     3582140   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       18276     3588744   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       43156     7170884   1% /mnt/lustre