== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 13:13:58 (1777569238)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       20188     1251116   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       27456     1243848   3%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       25088     3581932   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20544     3586476   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45632     7168408   1%  /mnt/lustre