== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:13:41 (1775877221)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210176        9856     2198272   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       25600     3743744   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       25600     3743744   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       51200     7487488   1%  /mnt/lustre