== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 16:31:53 (1780345913)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       16240     1255064   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       19680     1251624   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21224     3585796   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23432     3583588   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44656     7169384   1%  /mnt/lustre