== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:27:37 (1781231257)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       14928     1256376   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       19324     1251980   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       31404     3575616   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12660     3594360   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       44064     7169976   1%  /mnt/lustre