== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 20:16:45 (1745626605)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       24684     1263004   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21656     1266032   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       23824     3583196   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       21444     3585576   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       45268     7168772   1% /mnt/lustre