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What is Redundancy?

The term redundancy relates to duplicating data sets to another source such as another hard disk drive. If it fails we have a backup. Redundant devices include disk drives, peripherals, servers, switches, routers, operating systems, applications, and databases.

Why is Redundancy important in a small business?

These are the three main types of redundancy related to IT:

Hardware Redundancy – Mitigating hardware failures with hardware side-by-side. Two of everything is the takeaway. If one fails they continue to function because another piece of physical hardware is takes over the load.

Data Redundancy – Data redundancy is used to duplicate the data within the computer system. This method is called an redundant array of inexpensive disks (RAID). There are various types of RAID. The most common is RAID 0 and 1. RAID 0 is when data is spanned and even distributed throughout multiple disks. Raid 1 mirrors data throughout multiple drives, if one fails they can utilize other drives that mirror similar data.

Software Redundancy – Often used for safety applications. They create three instances of software that mimic each other. If one instance fails they detect that they differ from each other. They cancel out the failed software module. Examples: medical equipment, anti-lock brakes, CPU constraints, and aviation fly-by-wire.

Although there are many forms of redundancy we have an easy description redundancy is implementing a backup for your backup server. While some may argue that a backup server is enough, we do not want it to be the single point of failure. What if the backup server hard disk drive goes down? With technologies such as redundant backup it can create a two-step backup process. If the first backup goes down it will have a secondary backup that is redundant to the first. There are disadvantages to redundancy. Implementing these redundancies can often be too complex that can potentially lead to errors. Not to mention the cost of implementing these technologies can often lead to financial burdens. It’s important to realize the capabilities of Redundancy. This could correlate to how much your company wants to invest in the cloud. Which cloud solution works best for you? With a public cloud you can practically disregard redundancy. Cloud providers invest millions of dollars creating and maintaining redundant datacenters.

Information Technology Glossary

3G/4G/5GHardware RedundancyPersonal Cloud
Agile DevelopmentHybrid CloudPrivate Cloud
Big DataIaaSPublic Cloud
BYODInternet of Things (IoT)Redundancy
Cloud StorageISP RedundancySaaS
CybersecurityMobile AppsVirtualization
Geographic RedundancyPaaSWeb Apps

Office 365 Advisors Glossary

Below here we have an additional glossary from our partner site Office 365 Advisors.

BlacklistsFederationOffice Pro Plus
Cloud ComputingForefrontSaaS
Dial-In ConferencingIntranetService Health
DNSLync OnlineSharePoint Online
Exchange OnlineMigrationSLA
ExtranetOffice 365 PortalWhitelists