== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 16:46:33 (1778359593)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       23124     1248180   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19884     1251420   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       28804     3578216   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       16804     3590216   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45608     7168432   1%  /mnt/lustre