== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:14:23 (1787591663)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17592     1253712   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10196     1261108   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24912     3582108   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18692     3588328   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43604     7170436   1% /mnt/lustre