== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:10:12 (1763352612)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       13712     1257592   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19108     1252196   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       24684     3582336   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       18928     3588092   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43612     7170428   1%  /mnt/lustre