== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 04:41:58 (1789375318)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17568     1253736   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10052     1261252   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29864     3577156   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13740     3593280   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1% /mnt/lustre