== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:40:22 (1789321222)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       21276     1250028   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15616     1255688   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23844     3583176   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21532     3585488   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45376     7168664   1% /mnt/lustre