DDBoost FS with MongoDB performance issue

Hi All

I had performance issue about MongoDB use mongo dump to DDBoost FS

I was test

• Mongodb test database size 14.624GB：

Test 1

Mongo dump to DD NFS(No DDBoostFS)

16m42s

Test 2

Mongo dump to DDBoostFS

17m8s

Then I was check my DDBoostFS function use just copy data to DD NFS and DDBoostFS space

I got following result

move 5 G data to DD NFS about 8 minutes

mobe 5 G data to DDBoostFS about 4 minutes

any one know what Mongo dump  command I can try to use to test about mongo dump to DDBoostFS issue

This command I was reference in integration guide

Does any one can guide me