== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 11:24:06 (1789140246)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17972     1253332   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10304     1261000   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       24048     3582972   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       19512     3587508   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43560     7170480   1%  /mnt/lustre