== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 05:04:46 (1753434286)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       18984     1268704   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       23804     1263884   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       31292     3575336   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       13220     3593800   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44512     7169136   1% /mnt/lustre