Prototype Deployment

The following diagram shows the kind of architecture that is typical for a production system:

The key points depicted in the diagram are:

The platform is deployed across multiple servers.
A Load Balancer distributes traffic across the web servers.
Apache httpd is the front-end web server for the application server.
Learn more: Installing and Configuring Apache for Use with the Platform
Memcached servers reduce response time by caching data in memory.
Learn more: Configuring memcached
The suite of memcached servers are accessed by all application servers, backend as well as front end.
The critical backend processes shown here (import, export, and scheduling, which uses quartz) are all being run from a single platform instance. But additional servers can be employed, as load demands.
Learn more: Managing Backend Services
Document storage (which includes pictures and image files) is managed separately from the database.
The database is running on its own server, for added performance.
Learn more: Configuring MySQL to Run on a Separate Server
The primary database instance and the replication instance are each running on separate servers, both for reliability and for performance of read-intensive operations.
Learn more:

Requests that access and update, whether coming from a user or a backend process, go to the primary database, while read-intensive operations (backups, reports, exports) are executed on the replicated database.
Learn more: Running Reports and Storage Checks On a Replicated Database Server.