OpenStack is designed to provide more flexibility when setting up your building block architecture. A real robust OpenStack cloud platform includes fault tolerance at every level of the architecture. This can be marked as successful if it is planned ahead. Starting with a small cluster is easy and achievable, but growing it is a challenge. The hallmark of the OpenStack basic component itself is that it can run in commodity hardware. OpenStack is designed to scale massively and provide HA by leveraging more advanced HA techniques in each level of the infrastructure. This can include automatic failover and geo-redundancy.
Whatever the reason for a node failure, end users should keep running their applications and spawning instances with minimum disturbance or data loss.
For this reason, an OpenStack operator would be able to measure its cloud platform availability. A general formula to check the...