== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 07:43:39 (1778845419)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17808     1253496   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       20652     1250652   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30144     3576876   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15456     3591564   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45600     7168440   1%  /mnt/lustre