== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:37:43 (1747852663)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       25544     1262144   2% /mnt/lustre[MDT:0]
lustre-OST0000_UUID      3833116       23668     3583352   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       21148     3585872   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44816     7169224   1% /mnt/lustre