== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 00:39:01 (1789360741)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       16152     1255152   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       19340     1251964   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25340     3581680   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19348     3587672   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44688     7169352   1% /mnt/lustre