These specifications go up to 30 million page views per month. If high availability is required, it is recommended to set up at a minimum two appliance-based front-end web servers and the database server in a clustered or mirrored environment.
Page views are defined as any URL request for service via the Zimbra platform, including content for example, views to a blog or forum thread); files (for example, files served out of the Zimbra media gallery); RSS requests, and platform API calls.
Monitoring environment is important because every use case is different, and the infrastructure should be able to expand as site usage changes. If performance suffers on the database server, it might become necessary to break the Zimbra Analytics database apart from the Zimbra Social database.
This is a minimum recommendation.