== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 10:56:33 (1775141793)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17420     1253884   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       16160     1255144   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       29872     3577008   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       13732     3593120   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43604     7170128   1%  /mnt/lustre