== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 03:37:42 (1769762262)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       24992     1246312   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       22316     1248988   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       23752     3583268   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       21876     3585144   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45628     7168412   1%  /mnt/lustre