== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 10:11:49 (1788790309)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       19540     1251764   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11640     1259664   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26968     3579968   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16624     3590284   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7170252   1% /mnt/lustre