High server uptime is a necessity for any business that offers online services.
That’s because downtime can wreak havoc on your business, resulting in disappointed clients, revenue loss, and a damaged reputation.
For this reason, you might want to consider investing in server clusters to improve the uptime of your hosted web services.
Want to find out what other benefits you can get by using a server cluster? Read along and learn all about server clusters!
What is a Server Cluster?
A server cluster is a group of several servers that work together as a single hosting solution under the same IP address and host name.
By grouping multiple servers, server clusters minimize downtime and service outages by distributing the load of tasks across the servers.
Such architecture, also called a high availability cluster, ensures high server uptime and high-quality performance regardless of the requests load.
What’s more, server clusters support your business growth by enabling scalability for your hosted services.
Depending on the server type, scaling can be either automatic (using cloud servers) or manual (using other types of servers).
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How Do Server Clusters Work?
Here’s how service clusters work:
Each dedicated server within a server cluster is a node with its separate properties, such as a hard drive, RAM, and CPU. As such, each server node controls its devices, while at the same time maintaining a copy of the server cluster’s operating system, services, and applications.
At any given time, only one node within a server cluster is operating, while others are on a stand-by mode. In case an active node fails to serve a request, the server cluster redistributes the workload amongst the other nodes. Thanks to this feature, users experience no downtime while using your website or app but your server is busy.
The immediate switchover between server nodes is made possible by a quorum, which is a shared storage system used by all nodes in a server cluster. Typically, the quorum holds information on the server cluster infrastructure and tracks new changes.
In short, all nodes within a server cluster are programmed to collaborate. As such, server clusters help to avoid downtime by balancing the workload amongst several nodes.
3 Main Benefits of Using Server Clusters
The three main benefits of server clusters include increased availability, failover protection, and scalability.
Let’s take a detailed look at each of them:
#1. Increased Availability
High-availability server clusters offer increased availability for your hosted services by sending user requests to different nodes if one node is already busy.
So, for example, if you’re hosting a web app on a single server and it’s busy serving another host, you’ll have to wait until the server is free to respond to your request.
However, a server cluster has multiple nodes available at once. So, if one node is busy, another node is able to serve your request.
As such, high-availability server clusters allow more people to use your website or web app at the same time.
#2. Failover Protection
Failover protection is crucial as it maximizes server reliability. As such, it prevents data loss and service outage due to hardware malfunctions, software failure, or other issues (e.g. power outages caused by natural disasters).
Simply put, failover clustering ensures that your services don’t shut down in case your server fails.
Instead, if one server node fails, another node immediately takes over the operations without causing any downtime. This feature is crucial as downtime can result in unsatisfied clients or even revenue loss.
Whether you’re hosting a web application or a website, you might eventually outgrow your hosting solution and need more computing power.
This leads you to two options:
- Upgrading your dedicated server
- Using a server cluster
Server clusters give you tons of room to grow by allowing you to easily scale your hosted web services.
As such, using a server cluster enables you to have more content onto your website, upgrade your web application with more services, and more.
3 Types of Server Clusters
Based on how nodes are connected to the device that stores configuration data, server clusters fall into one of three types:
#1. Single Quorum Cluster
Also called the standard quorum cluster, a single quorum cluster is the most popular server cluster type.
This type of server cluster has several nodes with one or multiple cluster storage arrays that utilize a single connection device such as a bus.
All cluster disks arrays are managed and owned by a single server within the server cluster and each node notifies the central bus that it’s online and uncompromised.
The system that determines if each cluster is online and functional is called the titular quorum.
As long as more than 50% of the nodes in a single quorum cluster are functional and online, the cluster keeps operating. If not, the server cluster stops working until individual nodes are fixed.
#2. Majority Node Set Cluster
Majority node set clusters are most often used for server clusters that have server nodes located in several different geographic locations.
That’s because, in this server cluster type, each node owns and manages its copy of the cluster’s configuration data. With the help of quorum resources, this data stays consistent across all nodes.
Unlike in single quorum clusters, in majority node set clusters each node stores a copy of the quorum locally, so this server cluster type doesn’t need a shared storage bus to be functional, allowing more flexibility for remote server configuration.
#3. Single Node Cluster
Single node clusters contain a single node and are typically used for testing, developing, and researching cluster applications.
Single node clusters are rarely used outside of these circumstances. They are heavily limited due to the lack of failover protection, since the failure of one node disrupts the whole cluster.
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