== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:27:14 (1775878034)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19696     1251608   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       26880     1244424   3%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       23852     3583168   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       21560     3585460   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45412     7168628   1%  /mnt/lustre