== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 01:34:18 (1744090458)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       19556     1268132   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       26976     1260712   3% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       21492     3585528   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       23740     3583280   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       45232     7168808   1% /mnt/lustre