== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 17:27:38 (1784410058)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       21488     1249816   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15900     1255404   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       33152     3573868   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12384     3594636   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45536     7168504   1%  /mnt/lustre