== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:51:17 (1787799077)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11372     1259932   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16248     1255056   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22728     3584292   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20828     3586192   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1%  /mnt/lustre