== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:19:39 (1790702379)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       13260     1258044   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18124     1253180   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21932     3584696   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21652     3585228   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7169924   1% /mnt/lustre