== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 14:10:46 (1788286246)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116        9256     1262048   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16156     1255148   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28020     3578888   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15584     3591296   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170184   1%  /mnt/lustre