== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 18:13:24 (1790720004)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      2210176        7680     2200448   1% /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       23552     3723264   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       25600     3743744   1% /mnt/lustre[OST:1] 

filesystem_summary:      7542784       49152     7467008   1% /mnt/lustre