== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 07:37:28 (1743507448)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      2210176       10752     2197376   1% /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       26624     3738624   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       28672     3725312   1% /mnt/lustre[OST:1]

filesystem_summary:      7542784       55296     7463936   1% /mnt/lustre