== sanity test 56db: test 'lfs df -m' only shows MDT devices ========================================================== 23:20:18 (1763353218)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       19396     1251908   2%  /mnt/lustre[MDT:0]
lustre-MDT0001_UUID      1414116       18268     1253036   2%  /mnt/lustre[MDT:1]
lustre-OST0000_UUID      3833116       28752     3578268   1%  /mnt/lustre[OST:0]
lustre-OST0001_UUID      3833116       14808     3592212   1%  /mnt/lustre[OST:1]

filesystem_summary:      7666232       43560     7170480   1%  /mnt/lustre