== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 22:15:23 (1773108923)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19464     1251840   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       17752     1253552   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       26492     3580528   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       18084     3588936   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44576     7169464   1%  /mnt/lustre