== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 22:32:03 (1772681523)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210432       13952     2194432   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       26624     3742720   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       26624     3742720   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       53248     7485440   1%  /mnt/lustre