What is the maximum database size of mongodb 3.0.3 with WiredTiger engine

Question

What is the maximum database size of WiredTiger engine?
There is only the maximum database size of MMAPv1 on MongoDB Manual as below.
http://docs.mongodb.org/manual/reference/limits/

Answer 1

WiredTiger has no upper limit when sharded. It does not use mmap. It uses normal block I/O. To achieve high performance, it uses a bag of tricks like Log Structured Merge Tree, lock free algorithms, fine grained locks and many more
Ref:-
http://source.wiredtiger.com/1.4.2/architecture.html
http://www.slideshare.net/wiredtiger/mongo-db-worldwiredtiger