== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 18:16:34 (1746137794)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       19976     1267712   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       18216     1269472   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       21712     3585308   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       21452     3585568   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       43164     7170876   1% /mnt/lustre