Load balancing is a very important use case for server clusters. Load Balancing clusters are a server farm that distributes user requests to multiple active nodes to accelerate operations, ensure redundancy, reduce network congestion and overload, and improve workload distribution. Not only will users benefit from an enhanced website experience, but High Availability clusters help save costs through reduced downtime. High Availability clusters ensure reliability, seamless scalability, more efficient maintenance and robust infrastructure security. This is a lower-cost implementation compared to Active-Active. When one component crashes, a secondary server, known as a hot spare or hot standby, immediately takes over, because the database from the primary server has already been replicated to other nodes. On the other hand, an Active-Passive architecture means a primary node handles all workload, while a second is waiting to take over in case of downtime. An Active-Active cluster means all nodes work simultaneously to balance loads. High Availability clusters can have two different architectures, either Active – Active or Active – Passive. Comprised of multiple hosts ready to take over when a server shuts down, High Availability clusters guarantee minimal downtime in case of overload or server failure. They are critical for load balancing, system backups and failover, which combine to deliver full-time availability and ensure continuous website operation. High availability clusters avoid single points-of-failure, because they are built on redundant hardware and software. High Availability (HA) clusters are an optimal choice for high traffic websites, such as online shops or applications, to ensure critical systems remain reliable for optimal, continuous performance. There are four types of server clusters, each meeting different business objectives and infrastructure needs. For many businesses suffering from performance degradation, splitting off the database server can also enable fast and uninterrupted performance for high-volume workloads. Server clusters are often deployed by businesses in order to avoid downtime and maintain system accessibility, even in the event of a critical hardware failure. Subscribe to the Liquid Web newsletter for tips on infrastructure optimization.
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In addition, there are two usual types of server clusters – manual and automatic. Users will not even know that the server crashed. This is especially true if the OS fails, which does not have redundancy in a single-standing server. This kind of architecture, known as a high-availability cluster, prevents downtime if component failure hits. Ideally, multiple web and app nodes are utilized to guarantee hardware redundancy. Each server is a node with its own storage (hard drive), memory (RAM), and processing (CPU) resources to command.Ī two-node cluster, for instance, means that if one server crashes, the second will immediately take over. The real cost of tech glitches and outdated technology could mean millions.įor this reason, a large and growing number of businesses make a modest investment in upgrading their infrastructure to an architecture based on server clusters.Ī server cluster is a unified group of servers, distributed and managed under a single IP address, which serves as a single entity to ensure higher availability, proper load balancing, and system scalability. Almost all businesses rely on online services for critical business processes, if not directly for revenue.ĭowntime and performance disruptions represent lost productivity and sales, along with mitigation, reputation, and other costs.
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