== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 14:19:57 (1787854797)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17408     1253896   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10056     1261248   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       32232     3574788   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       11324     3595696   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170484   1%  /mnt/lustre