== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 04:09:30 (1761293370)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       15952     1255352   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       21404     1249900   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       29848     3577172   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       13704     3593316   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43552     7170488   1%  /mnt/lustre