What is the difference between uptime and availability?
“Uptime” refers to the ability to conduct business in the event of partial system failure or unexpected demand. Organizations can prioritize, modularize, and segregate their business functions, provide redundancies, and establish processes to turn on or off pieces of their system and still continue to function. “Availability” is a measure of the ability of clients to connect with and use a resource at any point in time. If a resource is not available, clients cannot use it. One way to understand high availability is to contrast it with fault tolerance. These terms describe two different benchmarks measuring availability. Fault tolerance is defined as 100% availability 100% of the time, regardless of the circumstances. A fault tolerant system is designed to guarantee resource availability. In contrast, a high-availability system is concerned with maximizing resource availability. A highly available resource is available a very high percentage of the time and may even approach 100% avail
