== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:53:09 (1788191589)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17616     1253688   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10120     1261184   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       27816     3579064   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15788     3591120   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170184   1%  /mnt/lustre