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High Availability Explained - Optimize Your Business Network

High availability is one of those topics that garners lots of different opinions. Ask a business or technology leader how much network downtime their company can tolerate, and they’ll answer “none” almost every single time. But what does “none” actually mean? More importantly, how much will “none” cost? In this video, we will talk about high availability, from a business perspective, and provide a foundation for developing an effective availability strategy for your business. The Problem: IT Hardware is GOING to fail. What’s important is that we understand and address what can be mitigated and have a plan of action for the items that cannot be mitigated. The Business Implications: Before we get started in planning high availability, we need to ensure that there is an actual business problem to solve. The first step in developing a strategy for high availability is to understand what impact a network outage of various systems would have on our ability to do business. The question of “How much network availability do I need?” is kind of like asking how long a piece of string is - it COMPLETELY depends on the impact the network outage would have to your company. How to Measure Network Availability: Most have probably heard of five 9’s as a standard for measuring network availability. In order to claim five 9’s, all of the network outages for a system added up can total no more than 5.26 minutes in a year - assuming a 24 x 7 operation. If we can reduce the combined network downtime for a system to no more than 31.5 seconds annually, we would have moved to six 9’s. Note that most companies would be thrilled just to achieve three 9’s or a total network downtime of 8.76 hours for system, annually. It’s critical that we measure downtime in any component that affects a part or the entire system for our measurements. How to Achieve Network Availability: Since there is no such thing as a system that will never fail, and we know it will take some period of time to restore operations, 100% network availability is not possible. In order to achieve more 9’s we will need to leverage redundancy and resiliency in our architecture, design and protocols. We are really only scratching the surface. But, this video should give you an idea of how critical it is to consider all of the layers that make up a business system. Dealing with the Cards You’ve Been Dealt: We need to understand ALL of the elements that could impact our deployment and then determine which ones we can effectively mitigate. The reality is that budgets are limited so when given lemons make lemonade. Be creative and mitigate what we CAN and understand what we CANNOT mitigate. This allows us to create contingency plans that work around these events. Design matters and the architecture, design and hardware selected will have a tremendous impact on how available your final business system is. At the end of the day, thinking outside the box and leveraging creative solutions will deliver an optimal deployment with a minimal investment.