== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 13:31:56 (1772476316)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       18472     1252832   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       25824     1245480   3%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       31960     3574864   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       13740     3593168   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45700     7168032   1%  /mnt/lustre