== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 10:38:02 (1787150282)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11484     1259820   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16388     1254916   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       22928     3583980   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       20620     3585896   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43548     7169876   1%  /mnt/lustre