== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 22:26:42 (1745461602)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       18536     1269152   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       25504     1262184   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       28236     3578784   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       16088     3590932   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44324     7169716   1% /mnt/lustre