== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 19:35:14 (1788478514)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       12980     1258324   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17964     1253340   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22840     3584096   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20752     3586156   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43592     7170252   1% /mnt/lustre