== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 00:32:49 (1789187569)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11716     1259588   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16504     1254800   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28852     3578168   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14704     3592316   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1% /mnt/lustre