== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 15:37:31 (1767731851)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       18428     1252876   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       25884     1245420   3%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       88480     3518540   3%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       22688     3584332   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232      111168     7102872   2%  /mnt/lustre