== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 09:53:03 (1787147583)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11672     1259632   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16308     1254996   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26700     3580320   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16904     3590116   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1%  /mnt/lustre