== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 15:50:25 (1787860225)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       11660     1259644   1%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       16404     1254900   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26812     3580208   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16740     3590280   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1%  /mnt/lustre