== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 07:33:41 (1743507221)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      2210176       10496     2197632   1% /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       29696     3714048   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       25600     3743744   1% /mnt/lustre[OST:1]

filesystem_summary:      7542784       55296     7457792   1% /mnt/lustre