== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:31:31 (1786807891)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      2209920       12160     2195712   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      2209920       10112     2197760   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3771392       33792     3735552   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3771392       16384     3752960   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7542784       50176     7488512   1%  /mnt/lustre