== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 10:34:26 (1787668466)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2209792       10368     2197376   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      2210048        8320     2199680   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3771392       20480     3725312   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       29696     3734528   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7459840   1%  /mnt/lustre