== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 09:22:14 (1743513734)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       22160     1265528   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19564     1268124   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       32460     3574560   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       11716     3595304   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44176     7169864   1% /mnt/lustre