== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 01:41:41 (1789191701)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       15332     1255972   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18924     1252380   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32384     3574636   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12172     3594848   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44556     7169484   1% /mnt/lustre