== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 23:39:51 (1788752391)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      2210176        8448     2199680   1% /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       23552     3745792   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       26624     3742720   1% /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7488512   1% /mnt/lustre