== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:28:56 (1785770936)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19312     1251992   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       11904     1259400   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24024     3582912   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19556     3587072   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43580     7169984   1%  /mnt/lustre