== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 02:41:11 (1783147271)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       16988     1254316   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       20020     1251284   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30020     3577000   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15436     3591584   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45456     7168584   1%  /mnt/lustre