== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:14:06 (1746155646)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       16484     1271204   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       22304     1265384   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       28012     3579008   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       15648     3591372   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       43660     7170380   1% /mnt/lustre