== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 07:42:11 (1769085731)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19160     1252144   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       26116     1245188   3%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       22416     3584604   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       22400     3584620   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       44816     7169224   1%  /mnt/lustre