== sanity test 56Db: test 'lfs df -m' only shows MDT devices ========================================================== 13:59:07 (1782496747)
UUID                   1K-blocks        Used   Available Use%  Mounted on
lustre-MDT0000_UUID      1414116       13324     1257980   2%  /mnt/lustre[MDT:0] 
lustre-MDT0001_UUID      1414116       17932     1253372   2%  /mnt/lustre[MDT:1] 
lustre-OST0000_UUID      3833116       31136     3575884   1%  /mnt/lustre[OST:0] 
lustre-OST0001_UUID      3833116       12400     3594620   1%  /mnt/lustre[OST:1] 

filesystem_summary:      7666232       43536     7170504   1%  /mnt/lustre