== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:07:11 (1775876831)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210176        9600     2198528   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       23552     3745792   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       24576     3744768   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       48128     7490560   1%  /mnt/lustre