== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:33:20 (1788575600)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       17472     1253832   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10080     1261224   1% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24912     3581716   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18644     3588236   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7169952   1% /mnt/lustre