== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 07:16:34 (1744888594)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       17656     1270032   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       24076     1263612   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       28148     3578872   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       16028     3590992   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44176     7169864   1% /mnt/lustre