what is high availability load balancing

What Is High Availability Load Balancing?

Enterprises today are more dependent on computer networks—innovations like mobile broadband, multi- and hybrid cloud environments and virtualization have changed how businesses receive, process, and store data. These have brought remote work and Bring-Your-Own-Device policies into companies, making it a must for IT to ensure high availability.

From applications to load balancing software, your data center needs high availability. Here are some things to consider when choosing a delivery controller for your online processes.

Why You Need a Highly Available System

Service interruptions cause businesses to lose money. With high availability, you eliminate points of failure in your infrastructure. For example, you could deploy components that perform health checks, detect potential failures, and redirect traffic. Doing this prevents downtime.

Although fault tolerance is vital for operations, you must also consider the application delivery controllers or load balancers. If not, it risks overflow and application performance, impacting the servers under it.

How Systems Provide High Availability

There are several ways to ensure that load balancers provide high availability. For one, you could deploy a balancer to be on active-standby. In this configuration, you get a fully redundant instance of each delivery controller you can bring online if the primary node fails.

Active-active configurations deploy multiple similarly-configured ADCs for routine use. If one node fails, one or more of the other nodes take over its traffic and balance the load. With this approach, system administrators assume that the server load balancing software would have sufficient capacity and function normally even when one node is down.

With an N+1 configuration, there is one or more extra ADCs to be brought online only if the primary balancers fail. It is a more affordable way of providing redundancy compared to active-standby. For this approach, balancers enable disaster recovery and fault tolerance, managed through the virtual router redundancy standard.

What Features to Look for to Ensure High Availability

If a server fails, the ADC could reroute traffic to available servers in a cluster, ensuring high availability for applications. Look for several features in your delivery controller, like the load balancing and health monitoring methods.

You must consider several things for server selection; ADCs must offer round-robin, weighted round-robin, least and weighted least connections, fastest response, and others. Various software environments and business priorities require different types of configurations.

Apart from server selection, your ADC must also be capable of assessing server health based on indicators like time series of traffic rates and total bytes in and out of servers, percent of error traffic over a range, average application server latency, client-side latency, and others. These factors are critical in ensuring rapid failover without downtime.

Work with Server Health Specialists

Mission-critical work such as enterprise resource planning or collaboration needs an always-on system, but even the most robust software or systems can suffer from downtime. To avoid this, IT specialists must build systems that use fault tolerance and redundancy for fast disaster recovery. With a highly available system, you will avoid downtime and keep operations running.

Ensure high availability when you avail of application delivery and load balancing solutions by Resonate. We are committed to providing top-quality traffic and systems performance for our clients in various environments. Contact us today to learn more.

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