== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 21:29:19 (1777426159)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       24776     1246528   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19936     1251368   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       27752     3579268   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       17604     3589416   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45356     7168684   1%  /mnt/lustre