== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 15:41:54 (1780342914)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       17548     1253756   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       10172     1261132   1%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       26812     3580152   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       16788     3590176   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43600     7170328   1%  /mnt/lustre