== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 14:17:33 (1774894653)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19992     1251312   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       27528     1243776   3%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       29808     3577212   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       15836     3591184   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       45644     7168396   1%  /mnt/lustre