== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 19:41:55 (1787874115)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       13164     1258140   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       18036     1253268   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22048     3584580   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       21516     3585392   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43564     7169972   1%  /mnt/lustre