== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 19:09:06 (1761260946)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17232     1254072   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       16076     1255228   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       25880     3581140   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       17672     3589348   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43552     7170488   1%  /mnt/lustre