== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:54:49 (1775879689)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       14632     1256672   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20248     1251056   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       32116     3574904   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       11432     3595588   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43548     7170492   1%  /mnt/lustre