== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 11:06:22 (1774883182)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210176       10112     2198016   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       23552     3745792   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       27648     3721216   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       51200     7467008   1%  /mnt/lustre