== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 09:59:15 (1787839155)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11292     1260012   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16088     1255216   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22736     3583808   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20852     3586168   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43588     7169976   1%  /mnt/lustre