A web cluster is a technology that allows a single intranet to be installed on multiple servers - a situation which solves several important issues such as optimizing availability and performance, load and traffic balancing, and duplication of data for practically fail-proof data security.
Geographically distributred web clusters spread the intranet among multiple data centers in different cities or countries, where each cluster has a master server that is working in coordination with the other master servers. Thus, instantaneous backup in the event of failure at one site is provided.
Clusters also greatly ease scalability and backup, since new servers and storages can be brought on and off line while the system continues to work normally. Furthermore, configuring new servers and converting from slave to master is enabled by a wizard present in the product.
|Blog: Web Clusters in Bitrix + Virtual Appliance 3.0 with web cluster support|