== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 03:39:44 (1759822784)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      2210304       14464     2193792   1% /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3771392       24576     3744768   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       25600     3743744   1% /mnt/lustre[OST:1]

filesystem_summary:      7542784       50176     7488512   1% /mnt/lustre