== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:25:32 (1788575132)
UUID                   1K-blocks        Used   Available Use% Mounted on 
lustre-MDT0000_UUID      1414116       11248     1260056   1% /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16072     1255232   2% /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       23720     3583160   1% /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19864     3587016   1% /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43584     7170176   1% /mnt/lustre