== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 12:44:27 (1783961067)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19340     1251964   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11852     1259452   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21992     3584916   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21600     3584972   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7169888   1%  /mnt/lustre