== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 11:39:33 (1775835573)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210304        9984     2198272   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       23552     3745792   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       26624     3742720   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       50176     7488512   1%  /mnt/lustre