== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:56:02 (1763355362)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       22564     1248740   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19972     1251332   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       25652     3581368   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       19900     3587120   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45552     7168488   1%  /mnt/lustre