== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 12:07:26 (1782490046)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       13584     1257720   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18348     1252956   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32104     3574832   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11452     3595204   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170036   1%  /mnt/lustre