== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 08:19:14 (1787833154)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       12984     1258320   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17928     1253376   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       27948     3578820   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15624     3591396   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43572     7170216   1% /mnt/lustre