December 3, 2023


Rich Inside You

Server Redundancy for Uninterrupted Enterprise Operations

12 min read

In an period the place the digital realm intertwines seamlessly with our day by day lives, the steadiness and accessibility of digital companies stand as pillars of paramount significance.

Think about a state of affairs the place an eCommerce platform experiences an sudden server crash throughout a peak procuring season or a cloud-based utility encounters downtime simply as customers try and entry vital information. The repercussions of such disruptions might be far-reaching, impacting person experiences, income streams, and reputations.

Enter the sentinel of stability: server redundancy. 

With its roots deeply embedded within the pursuit of extremely accessible techniques, server redundancy represents a strategic strategy that ensures reliability and minimizes the affect of downtime, fostering an setting the place know-how works seamlessly for us moderately than in opposition to us.

By understanding server redundancy, you may mitigate downtime points, safeguard your information, and preserve the seamless functioning of your small business operations. 

Whether or not you are an IT supervisor, a community administrator, or a enterprise proprietor, this complete information will give you the data and insights essential to leverage server redundancy to its fullest potential.

Desk of contents

Understanding the significance of server redundancy

Server redundancy entails utilizing extra or redundant servers to copy the features of major servers. 

The objective is to make sure companies stay uninterrupted and information stays accessible, even throughout {hardware} failures, system crashes, or different sudden points.

The absence of server redundancy can expose companies to a variety of potential dangers and penalties, similar to:

  • Information loss — This will happen if a server fails and there is no backup system to protect the data. 
  • System downtime — Any interruption to server operations can disrupt enterprise actions, resulting in a drop in productiveness and potential income loss.
  • Reputational hurt — Clients and purchasers might lose belief in a enterprise that may’t reliably preserve its digital companies.

Advantages of redundant servers

By creating different pathways for information circulate, redundant servers supply a variety of advantages that may improve system reliability and efficiency, similar to:

  • Information safety — Redundant servers guarantee information integrity and accessibility. They stop information loss by storing copies of all info and permitting entry to those copies if the first server goes offline.
  • Downtime discount and boosting enterprise continuity — These server replicants are essential for minimizing the operational affect of server failures and sustaining enterprise continuity.
  • Catastrophe restoration capabilities — Within the occasion of a significant incident or failure, redundant servers permit for fast system restoration, minimizing the restoration time and lowering the potential injury to the enterprise.
  • Scalability As a enterprise grows, its server wants will develop, too. With redundant servers, firms can simply broaden their infrastructure as wanted and add extra capability with out disrupting current operations, offering a easy pathway for development.

Core server redundancy ideas

There’s a distinction between the ideas of server redundancy and the varieties of server redundancy. The core ideas of server redundancy are the alternative ways a number of servers can be utilized to make sure that vital functions and information are at all times accessible. These embrace:


Failover is the method of robotically redirecting site visitors from a failed server to a wholesome, redundant server. This ensures that if the first server turns into unavailable, the backup server takes over with out disruption to companies. 

Companies can implement failover at numerous ranges, together with {hardware}, software program, and utility layers.

Load balancing

Load balancing refers back to the apply of distributing incoming community site visitors or workloads throughout a number of servers or assets. It offers extra capability throughout high-traffic durations, stopping efficiency degradation, sustaining optimum person experiences, and guaranteeing no single server is overwhelmed. 

The first objectives of load balancing are to optimize useful resource utilization, improve system reliability, and be sure that no single server turns into overwhelmed with an excessive amount of site visitors or workload. The load balancer receives all incoming requests after which distributes them to the servers within the pool primarily based on a set of algorithms. The commonest load-balancing algorithms are:

  • Spherical robin — With this algorithm, the server requests are distributed, that means every server will get an equal variety of requests.
  • Weight-based — This algorithm distributes requests primarily based on the load of every server. A server with a better weight will obtain extra requests than one with a decrease weight.
  • Fewest connections — This algorithm distributes requests to the server with the fewest connections. This helps to make sure that no server is overloaded.
  • Well being checks — Load balancers may also carry out well being checks on servers to make sure they’re up and operating. If a server is unhealthy, the load balancer will cease sending requests.

The optimum algorithm is determined by the particular wants and configuration of your community. Your community might require algorithms to suit the next two wants:

  • Community load balancing (NLB) — Incoming site visitors is distributed throughout a number of servers, guaranteeing even distribution of workloads and stopping any single server from turning into overwhelmed.
  • Utility load balancing — Load balancers direct requests to particular servers primarily based on components like server well being, capability, and the kind of request.

This proactive strategy is vital to sustaining a sturdy, dependable, high-performing IT infrastructure.


Replication entails copying information from a major server to a number of secondary servers. This may be synchronous (actual time) or asynchronous (with a delay). There’s additionally semi-synchronous replication, which gives a center floor between the 2. 

Replication enhances information availability however can result in information inconsistencies in asynchronous setups.


Mirroring entails sustaining an similar dataset in two or extra places. That is usually used with databases, the place each transaction carried out on the first is replicated on the mirror. 

This ensures information consistency however requires excessive community bandwidth for real-time synchronization.

Restoration time goal (RTO) and restoration level goal (RPO)

RTO is the focused period inside which a system ought to be restored after a failure, whereas RPO is the utmost tolerable quantity of information loss measured in time. 

These ideas assist outline how shortly the redundancy system must kick in and the way a lot information loss is appropriate.

Lively-passive redundancy

In an active-passive setup, one server (the lively) handles the workload whereas one other (the passive) stays on standby. If the lively server fails, the passive one takes over. This technique ensures seamless service continuity, even when the first server fails.

Take into account a enterprise that runs a vital utility that can’t afford downtime however does not must function at full capability on a regular basis. An active-passive redundancy setup can be ultimate right here, because the standby server ensures continuity if the first server fails.

Lively-active redundancy

Lively-active redundancy entails a number of servers actively dealing with the workload concurrently. If one server fails, the others proceed, guaranteeing no service interruption.

This setup is helpful for an eCommerce web site experiencing excessive site visitors volumes that should stay accessible 24/7. A number of servers share the workload. If one server fails, others proceed serving customers with out interruption.

N+1 redundancy

N+1 redundancy is a normal redundancy strategy the place N represents the variety of parts (like servers) wanted for operation, whereas +1 is an extra backup. If any of the N parts fail, the backup ensures continuity.

For example, think about an information heart has 10 cooling items however solely requires 9 to keep up the appropriate temperature. If one cooling unit fails, the backup unit can stop overheating.

M+N redundancy

M+N server redundancy offers a better degree of availability than N+1 redundancy. In M+N redundancy, there are N extra servers past the minimal quantity wanted to carry out the required duties. This implies the system can nonetheless operate even when M servers fail.

For instance, if an internet site requires three servers to operate, an N+1 redundancy scheme would require 4 servers. It is because one server can be the backup for the opposite three. Nevertheless, an M+N redundancy scheme would require seven servers. Three servers can be the minimal quantity wanted to operate, and 4 extra servers can be accessible as backups.

M+N redundancy is a costlier and sophisticated answer than N+1 redundancy. Nevertheless, it offers a better degree of availability and is usually a good selection for mission-critical techniques.

Exploring varieties of redundant servers

You may implement the above redundancy ideas by selecting from the next varieties of redundant servers that finest swimsuit your small business wants and assets:

Standby servers

Standby servers are backup techniques that take over when the first server fails. Relying on how they’re arrange, they are often categorised as sizzling, chilly, or heat.

  • Sizzling standby server — This duplicate system runs parallel to the first system. It might probably take over instantly within the occasion of a failure, guaranteeing no service disruption. Nevertheless, sustaining a sizzling standby might be costly because of the want for duplicate {hardware} and fixed synchronization.
  • Chilly standby server — This backup system might be began if the first fails. It won’t have the latest information and should take longer to get on-line, nevertheless it’s inexpensive to keep up than a sizzling standby.
  • Heat standby server — It is a middle-ground possibility between cold and hot. It is normally up and operating however not processing dwell information. It might probably take over quicker than a chilly standby however should still require handbook steps.


In a cluster, a number of servers work collectively and are considered as a single system. There are two totally different cluster configurations:

  • Lively-active clusters — All servers within the cluster run functions and share the workload. This will increase efficiency and availability however requires advanced synchronization to forestall information inconsistencies.
  • Lively-passive clusters Just one server handles the workload whereas the others stay on standby. This offers excessive availability at a decrease value however doesn’t improve efficiency.

Distributed techniques

In distributed techniques, parts run on networked computer systems that talk and coordinate their actions to look as a single coherent system. This design can present excessive availability and efficiency however requires cautious administration to forestall information inconsistencies. 

An vital idea in distributed techniques is the CAP theorem (also called Brewer’s theorem), which states that it is not possible for a distributed system to concurrently present consistency, availability, and partition tolerance. 

For instance, a system that prioritizes consistency might sacrifice availability or partition tolerance. A system that prioritizes availability might sacrifice consistency or partition tolerance. Companies should perceive these trade-offs when designing their redundant server technique.

Geographic redundancy 

Often known as catastrophe restoration, geographic redundancy entails having backup servers and information facilities in several geographical areas. If a pure catastrophe, energy outage, or different catastrophic occasion impacts one location, companies can proceed from one other.

A world firm, for example, providing a cloud service and needing to guard in opposition to regional disasters (e.g., earthquakes, floods) would profit from this setup. If a disaster impacts one information heart in a single area, an information heart in one other area can take over, guaranteeing steady service availability.

Implementing server redundancy: Steps and concerns

Implementing server redundancy is a multifaceted course of that requires cautious planning and execution. Listed below are the important thing steps concerned:

  1. Evaluation — Begin by figuring out your redundancy wants primarily based on danger, criticality, and price range. Establish which techniques are vital to your operations and what the affect can be in the event that they had been to fail.
  2. {Hardware} — Purchase similar or appropriate servers/parts for backup. This ensures easy failover in case the first server goes down.
  3. Software program — Guarantee constant software program and working system variations throughout servers. Common updates are essential to sustaining system safety and efficiency.
  4. Community configuration — Implement load balancers, outline IP failover, and arrange mirrored storage or shared storage options. VLAN configurations and subnet design may also play roles in redundancy methods, particularly in bigger environments.
  5. Information sync — Maintain information synchronized between major and redundant servers utilizing options like database replication. This ensures information availability even when the first server fails.
  6. Failover mechanisms Arrange computerized failover processes and check them recurrently. This ensures that your system can shortly swap to a backup server in case of major server failure.
  7. Monitoring — Implement monitoring instruments to observe for server well being, efficiency, and potential failures. Early detection of points can stop downtime and information loss.
  8. Common testing — Simulate failures periodically to make sure redundancy techniques work as meant. This helps establish and repair any points earlier than they trigger actual issues.
  9. Alerting and communication — Have efficient alert mechanisms in place and make sure the proper individuals are knowledgeable in case of failures. It is also vital to have a communication plan for patrons/customers in case of outages.
  10. Coaching and documentation — Be certain that IT employees are skilled on the redundancy techniques in place and preserve clear documentation for troubleshooting. This helps guarantee fast and efficient responses to any points.

To make your redundancy endeavor even smoother, hold the next concerns in thoughts:

  • Select the appropriate sort of redundancy for your small business wants and price range. Not each system may have the best degree of redundancy.
  • Leverage virtualization applied sciences (e.g., VMware)to scale back {hardware} prices and improve flexibility.
  • Maintain all configurations, software program, and techniques up to date to forestall efficiency points and safety vulnerabilities.
  • Have a transparent catastrophe restoration plan and enterprise continuity plan in place. Redundancy is usually tied to those methods, so it is vital to think about them collectively.
  • Take into account managed internet hosting companies, like Liquid Internet,if managing redundancy in-house is just too advanced or pricey. These companies can deal with all elements of server redundancy for you, guaranteeing excessive availability and efficiency with out the necessity for in-house experience.

How Liquid Internet options assist server redundancy

Liquid Internet is a number one internet hosting supplier identified for providing high-performance internet hosting companies with a give attention to reliability, safety, and buyer assist. Even higher, Liquid Internet gives a variety of internet hosting options designed to assist server redundancy and guarantee excessive availability and efficiency for your small business, like:

  • Server clusters — Liquid Internet’s server clusters present customized platforms designed for max uptime. These clusters make the most of a number of servers to make sure that if one server fails, the others can take over, successfully lowering the chance of downtime.
  • Excessive availability A high-availability setup ensures that your web site stays accessible even when one server fails, offering a dependable on-line presence for your small business. Liquid Internet’s high-availability internet hosting gives multi-server setups to attenuate downtime.
  • Cloud devoted and VMware non-public cloud Liquid Internet’s cloud devoted servers and VMware non-public cloud options supply inherent redundancy advantages. They supply a versatile and scalable setting that ensures excessive availability and efficiency.
  • Database internet hosting With redundant options, your small business can guarantee the provision and integrity of your information with Liquid Internet’s database internet hosting options. 
  • Non-public VPS mum or dad — With Liquid Internet’s non-public VPS mum or dad, you may deploy a number of redundant VPS on a non-public server. This setup offers a excessive degree of management and suppleness, permitting you to handle your assets successfully.
  • Excessive efficiency — Liquid Internet’s high-performance options distribute site visitors throughout servers for load stability. This not solely enhances efficiency but additionally acts as a redundancy mechanism, guaranteeing steady system availability.
  • Health Insurance Portability and Accountability Act (HIPAA) compliant internet hosting Holding delicate information safe and accessible, Liquid Internet’s HIPAA compliant internet hosting offers a redundant infrastructure for healthcare information. 
  • Customized options — Whether or not you want a singular redundancy configuration or a particular server setup, Liquid Internet can present an answer that meets your necessities. 

Along with these strong redundancy options, Liquid Internet gives 24/7 buyer assist and complimentary migrations. These value-added companies can ease the method of establishing and sustaining server safety and redundancy, guaranteeing a easy and hassle-free expertise for your small business. With Liquid Internet, you may have peace of thoughts figuring out that your on-line presence is dependable, safe, and extremely accessible.

Whether or not you are a small enterprise or a big enterprise, Liquid Internet has an answer tailor-made to your particular wants.

Enhance your server infrastructure with Liquid Internet

Server redundancy is a vital technique for guaranteeing excessive availability, reliability, and efficiency in your IT infrastructure. By implementing redundant servers and complementary methods, you may considerably scale back the chance of downtime and information loss.

Nevertheless, establishing and managing server redundancy requires cautious planning, common upkeep, and a deep understanding of your community’s wants and assets – that is the place Liquid Internet is available in!

With a variety of internet hosting options, from absolutely managed internet hosting to excessive availability internet hosting and cloud VPS internet hosting, Liquid Internet will help you implement and handle server redundancy successfully.

Liquid Internet’s tailor-made options, similar to server clusters, cloud devoted servers, and HIPAA compliant internet hosting, supply inherent redundancy advantages.

Do not depart your small business’s uptime to likelihood. Contact Liquid Internet right this moment to enhance your server infrastructure and expertise the peace of thoughts that comes with dependable and high-performing redundant servers!