The Mollom infrastructure was built from the ground up to be scalable and robust. Mollom has servers in multiple independent data centers around the world, providing a high degree of redundancy.
Mollom also uses a load balancing mechanism: when one of the Mollom servers is down or overloaded, your site can move on to the next Mollom server. This mechanism allows for high availability, as it is unlikely that different servers in different data centers around the globe would simultaneously be unavailable. Mollom servers are permanently monitored, and Mollom has technicians on call that can respond to any emergency 24/7 should any issue arise.
Mollom provides paying customers a Standard Service Level Agreement that sets forth the service delivery criteria that Mollom endeavors to achieve with respect to the Mollom servers. Mollom users with a free Mollom subscription do not receive any service level agreements.