== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:15:54 (1772478954)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       22756     1248548   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       19744     1251560   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       31980     3575040   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       13552     3593468   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45532     7168508   1%  /mnt/lustre