Server Clustering: What Is It, Its Types, And Benefits

December 9, 2022 / Dedicated Servers


Almost all organizations rely on online services for crucial company functions and revenue. Downtime can lead to lost income and productivity. Additionally, performance problems could damage your reputation. Real-world costs associated with outages, software errors, and old technology could total millions. The good news is that by utilizing server clusters in your architecture, you may prevent these failures.

What is server clustering?

A coordinated set of servers that are dispensed and controlled by a single IP address is known as a server cluster. Better availability, actual load balancing, and scalability are ensured by this configuration.

Each server functions as a node with its own RAM, CPU, and hard drive for processing data. For example, a two-node cluster arrangement means that the second physical server will take over right away if the first one crashes. This procedure, called failover clustering, aids in preventing downtime,

In order to provide hardware redundancy, you should ideally deploy numerous web and app nodes. A high-availability cluster is this type of infrastructure. If a component malfunctions, it helps avoid downtime.

This is particularly true if the operating system, which lacks redundancy in a single server, malfunctions. Your users won’t even be aware that the server collapsed because there won’t be any site issues.

Server clusters typically come in two kinds: manual and automated.

Since a node must be manually configured to the same data IP and address, manual clusters are not the best option. Even a couple of minutes outage could be costly or even crucial. However, automatic clusters allow you to pre-configure software. This particular cluster configuration switches servers on its own.

Types of Server Clusters

Server clusters come in four different varieties. The kind you pick will rely on your business goals and system requirements.

  1. High Availability Server Clusters Clusters with high availability (HA) are the best option for websites with a lot of traffic. For online stores or apps that require crucial systems to continue to function to perform at their best continuously, for instance, you might employ HA clusters.

    Since HA clusters are constructed with redundant software and hardware, you can prevent single points of failure. They are essential for system backups, failover, and load balancing. They are made up of many hosts that can take over if a server fails. If a server fails or is overloaded, this ensures little downtime. The architecture types of HA clusters are Active-Active and Active-Passive.

    All nodes in an active-active cluster balance load concurrently. In contrast, a primary node manages all workloads in an active-passive design. In the interim, a backup node is kept ready for outages.Because it houses the primary node’s database, the secondary server is often referred to as a hot standby or a hot spare. This is a less expensive implementation than active-active because the hot standby is prepared to take over if a component fails.

    More reliability is provided by high-availability clusters, which also make scaling simple. Additionally, they provide stronger environmental security and more effective maintenance. You can cut expenses, reduce downtime, and improve user experience with these clusters.

  2. Load Balancing Cluster A server that distributes user requests among several active nodes is referred to as a load-balancing cluster. The key advantages are ensuring redundancy, speeding operations, and better job distribution. You can spread workloads amongst servers and separate functions using load balancing. The use of resources is maximized with this arrangement. It routes requests to various servers using load-balancing software based on an algorithm. The application also manages responses that are sent out.

    The load balancer is used by the High Availability cluster to respond to various requests and distribute them to several servers. Depending on the setup information and computer capabilities, the distribution may be symmetrical or asymmetrical. The load balancer tracks the availability of nodes in a high-availability active-passive cluster. Until a node is fully functional, it stops sending traffic to it if it shuts down.

    Additionally, using many links simultaneously is possible with the load-balancing environment. Particularly helpful in infrastructure that needs redundant communication is this capability. For instance, data centers and telecommunications firms frequently use this architecture. Cost savings optimized high-bandwidth data transport, and improved scalability is the key advantages.

  3. High-performance and clustered storage Supercomputers (high-performance clusters) provide more capacity, performance, and dependability. Organizations with resource-concerted tasks tend to use them the most. A high-performance cluster consists of a large number of computers linked together via a common network. Additionally, you can link several of these clusters to the data storage facilities to process data efficiently. You achieve smooth functioning and high-speed data transfers by utilizing data storage and high-performance clusters.

    With artificial intelligence and Internet of Things (IoT) technology, these clusters are frequently employed. To fuel initiatives like real-time streaming, storm forecasting, and patient diagnosis, they handle massive data in real time. And so, high-performance cluster applications are frequently employed in research, finance, and media.

  4. Clustered storage At least two storage servers make up clustered storage. They enable you to boost the efficiency, dependability, and I/O (input/output) of your system. You can choose a light or tightly connected architecture depending on your firm and storage needs. The primary storage is targeted by a tightly connected architecture. Between nodes, it divides data into manageable pieces.

    A self-contained, loosely connected design, on the other hand, offers more freedom. However, data is not stored across nodes. Performance and capacity are loosely linked architecture that is constrained by the abilities of the node that is storing the data. Contrary to tightly connected architecture, scaling does not need adding new nodes.

Advantages of Clustering Servers

  1. Scalability and flexibility A single server manages every aspect of a company’s network setup and storage needs. The flexibility of the server can be greatly increased by using a multi-server design with clustering capabilities.

    Alternatively put, clustering enables you to scale up one server to meet the rising resource demand. In addition, adding a new node to an already existing cluster is easier for enterprises. If your dedicated server hosting is managed, you can do this with just a phone call.

  2. Lower IT costs To guarantee that consumers may connect to a company’s network at all times, redundancy must be integrated into the network. In addition, the servers must function as a single system. By eliminating downtime and reducing expenses by keeping the server functional, a clustered environment aids in this. To put it another way, clustering enables continuous uptime. Clustered servers increase network performance while lowering risk vulnerability since they are set up to cooperate on a single network.


To prevent downtime and retain system accessibility even in the event of severe hardware failures, businesses should opt to implement server cluster systems. The cluster design is also perfect for companies whose performance is declining. They can separate the database server to provide quick and continuous performance for heavy workloads. Businesses are continually looking for ways to boost productivity and optimize data centers. A server cluster offers scalability, stability, and redundancy for customers that require a high-availability solution.


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