== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 00:59:21 (1773205161)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210176       10240     2197888   1%  /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       23552     3743744   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       27648     3739648   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       51200     7483392   1%  /mnt/lustre