== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 06:52:22 (1768132342)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       22844     1248460   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       20100     1251204   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       29000     3578020   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       16480     3590540   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45480     7168560   1%  /mnt/lustre