== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:15:53 (1779992153)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       13984     1257320   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19344     1251960   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       20892     3586128   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       22692     3584188   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43584     7170316   1%  /mnt/lustre