== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 07:43:37 (1788522217)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19184     1252120   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11820     1259484   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29104     3577832   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       14448     3592152   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7169984   1%  /mnt/lustre