== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 18:44:00 (1768261440)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2208512       18304     2188160   1%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      2208512       17024     2189440   1%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3771392       29696     3724288   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3771392       19456     3740672   1%  /mnt/lustre[OST:1]

filesystem_summary:      7542784       49152     7464960   1%  /mnt/lustre