== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 09:07:56 (1788613676)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17420     1253884   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       16252     1255052   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       26676     3580344   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       16872     3590148   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43548     7170492   1%  /mnt/lustre