== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 21:03:56 (1746147836)
UUID                   1K-blocks        Used   Available Use% Mounted on
lustre-MDT0000_UUID      1414116       20788     1266900   2% /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       18956     1268732   2% /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       24040     3582980   1% /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       20128     3586892   1% /mnt/lustre[OST:1]

filesystem_summary:      7666232       44168     7169872   1% /mnt/lustre