== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 06:42:06 (1765107726)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2209280       19072     2188160   1%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      2209280       17536     2189696   1%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3771392       28672     3740672   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       23552     3745792   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       52224     7486464   1%  /mnt/lustre