You can install multiple instances of WSO2 products in a cluster to ensure that if one instance becomes unavailable or is experiencing high traffic, another instance will seamlessly handle the requests. For specific instructions on how to cluster WSO2 MB, see Clustering WSO2 MB.
For complete information on clustering, including information on possible deployment patterns and keeping artifacts in sync across nodes using the Deployment Synchronizer, see WSO2 Clustering and Deployment Guide.