Amazon’s outage highlighted limitations of load balancing and failover systems designed to keep applications running in case of failure. Amazon isn’t the only cloud vendor whose systems can’t guarantee 100% uptime. Customers may have to work closely with the cloud vendor and purchase third-party load-balancing products. Spreading applications across multiple cloud vendors is not impossible but difficult due to a lack of standards and interoperability. GoGrid offers service credits to customers when uptime falls below 100%, but that doesn’t mean the service never goes down.”]
Source: https://www.csoonline.com/article/2128339/cloud-failover-a-challenge-for-amazon-competitors–too.html