== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 19:23:50 (1746141830)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       15236     1272452   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20820     1266868   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       22608     3584412   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       20556     3586464   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       43164     7170876   1% /mnt/lustre