== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 22:41:58 (1787712118)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17536     1253768   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10140     1261164   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       28020     3579000   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       15532     3591488   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43552     7170488   1%  /mnt/lustre