== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 04:32:54 (1788337974)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       20876     1250428   2% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       15060     1256244   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       21476     3585544   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       23228     3583792   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44704     7169336   1% /mnt/lustre