== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 19:27:11 (1787873231)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11524     1259780   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16312     1254992   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26880     3580140   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16684     3590336   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43564     7170476   1%  /mnt/lustre