== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 09:39:07 (1788356347)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2210048       11008     2196992   1%  /mnt/lustre[MDT:0] 
lustre-OST0000_UUID      3771392       22528     3746816   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       27648     3741696   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7488512   1%  /mnt/lustre