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Fail Over

What does Fail Over mean?

Fail Over (often also written “failover”) is a failover. This can be an entire system or just a single component. Freely translated one speaks in German also of a “Rückfall Sicherung”.

The background to this is the common visual representation of failover systems:

The backup is usually drawn next to or below the actual system or component in question. It therefore looks as if the system would “fall back” to the backup in case of an emergency. Often, therefore, there is additional talk of “fall back” components when it comes to specifically what “falls back” to where.

How do Fail Over fuses work?

  • The system or component in question is mirrored. 2.
  • 2. the hardware with the mirroring is kept in standby mode.
  • 3. if necessary, the backup jumps out of standby and can take over almost seamlessly.
  • 4. once the problem is resolved, the failover system jumps back to the wait state.

What are the advantages of Fail Over systems?

  • Systems can be temporarily taken off line for maintenance without causing a complete outage.
  • Hardware and software are given fault tolerance. This is the reason why failover backups find their way into virtually all disaster recovery plans (DRP). Here, it is often still required that the backup is locally separated from the actual system.
  • Sensitive processes (e.g. business processes) are protected.
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A stable failover system depends mainly on the amount of data changes in the primary system since the last mirroring. Therefore, the synchronization takes place at regular intervals and sometimes even in real time. Other factors that influence stability are the fire gap between the primary system and the backup, and the mirroring procedure. The main issue here is the order of what is transferred first.

Where are appropriate backups used?

In the past, servers were designed very simply. Failures therefore led to massive problems. That’s why this type of failover was invented in the digital domain in the first place. The model was the emergency power supply of hospitals.

Server architecture has improved a lot since then, but failover backups are still widely used here. The same is true for all critical processes across all industries. Energy providers, for example, often even work with more than one backup. In the private sector and in the small and medium-sized enterprise segment, these failover systems were not widespread for a long time because they were too costly. In the meantime, however, such a backup can also be implemented cost-effectively via Cloudsolutions. More and more users are therefore opting for Fail Over systems.

“The trade magazine ComputerWeekly answers the question of when such a backup makes sense as follows: “The decisive factor is how much time may pass before the most important Apps are available again.” Here, he says, a cost-benefit calculation must be made: Which is cheaper – the backup or the failure of the central programs?”

Related links:

https://www.computerweekly.com/de/definition/Failover
https://www.storage-insider.de/was-ist-ein-failover
https://www.itwissen.info/Failover-Cluster


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