== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 04:04:28 (1773216268)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       15420     1255884   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       16152     1255152   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       20920     3585876   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       22652     3584368   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43572     7170244   1%  /mnt/lustre