== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 12:40:59 (1786812059)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17620     1253684   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10172     1261132   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       29984     3577036   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       13568     3593452   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1%  /mnt/lustre