== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:15:44 (1787105744)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17560     1253744   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       20700     1250604   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23068     3583952   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       22564     3584456   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45632     7168408   1%  /mnt/lustre