== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 05:10:16 (1753434616)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       18216     1269472   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       25820     1261868   3% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       21612     3585324   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       24040     3582840   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       45652     7168164   1% /mnt/lustre