== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 21:47:27 (1787795247)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17620     1253684   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10156     1261148   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       30056     3576516   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13500     3593520   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43556     7170036   1%  /mnt/lustre