== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 20:53:39 (1775868819)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23132     1248172   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20092     1251212   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       30132     3576748   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       15532     3591292   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45664     7168040   1%  /mnt/lustre