Evaluating ObjectDB for SaaS Application

We are currently evaluating objectdb for our SaaS(multi-tenant) product. It is a data intensive health care product . We would like to know the horizontal scalability options available.

Horizontal scalability may be achieved by using replication.

Thanks for the reply. 

Why is write limited to master ? 

An architecture of one writer and multiple readers provides better performance because the coordination between the servers  is simpler and requires less networking operations.

ObjectDB doesn't provide the same level of horizontal scalability such as other popular NoSQL solutions, but it provides other advantages including better performance, full ACID, richer queries and rapid development.