== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 10:26:22 (1773239182)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       25500     1245804   3%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3833116       21448     3585572   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       23708     3583312   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45156     7168884   1%  /mnt/lustre