== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 15:26:27 (1781033187)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17208     1254096   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       20384     1250920   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       27012     3580008   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       18548     3588472   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       45560     7168480   1%  /mnt/lustre