== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 12:13:16 (1775837596)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       18128     1253176   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       25136     1246168   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       27956     3578980   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       17716     3589164   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45672     7168144   1%  /mnt/lustre