Advanced high availability (AHA) overview ServiceNow’s data centers and cloud‑based infrastructure are designed to be highly available with redundant components and multiple network paths to avoid single points of failure. At the heart of this architecture, each customer application instance is supported by a multi‑homed network configuration with multiple connections to the internet from different providers and with redundant power sources. ServiceNow’s data centers are arranged in pairs, with all customer production data hosted in both data centers simultaneously and kept in sync using asynchronous database replication. Both data centers are always active in a main‑main relationship with data replicated from the active (read‑write) data center to the passive (read‑only) data center. Each single data center in a pair is implemented so it can support the combined production load of both locations. Within each regional data center pair, there is no concept of a fixed primary location for any customer instance. For example, a customer with two separate instances could have them operating out of different data centers simultaneously. We leverage AHA for customer production instances for the following purposes: Prior to executing maintenance, ServiceNow can proactively transfer operation of a customer instance from one data center to the other. The maintenance can then proceed without impacting service availability.In the event of the failure of one or more infrastructure components, service is restored by transferring the operation of the affected instance to the other data center. With this approach, the transfer between active and standby data centers is regularly executed as part of our standard operating procedures. This ensures that when it is needed to address a failure, the transfer will be successful and service disruption is minimized. More information Find out more about how ServiceNow secures the Now Platform Watch the Cloud Security at ServiceNow: What you should know pre-recorded webinar Watch ServiceNow's Overview of Platform Architecture video Previous ArticleNext Article