== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 00:22:51 (1763356971)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23096     1248208   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20116     1251188   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       25824     3581196   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       19644     3587376   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45468     7168572   1%  /mnt/lustre