Introduction to Disaster Recovery

Disaster Recovery - Businesses want to choose reliable equipment, components, and technologies while designing a network. You may deploy the most reliable equipment from your trusted vendor or deploy the most mature technologies carefully do not forget eventually every system fails!

Depending on where is your data center located, different disasters may happen. For U.S storm, the tornado is not uncommon.

I remember just a couple of years before because of major flooding, Vodafone couldn’t serve their customer in Turkey for at least 1 day.

Thus, resiliency is an important aspect of the design plan.

Resiliency means, how fast you can react to failure with the simplest explanation. Disaster recovery is the response and remediation that a company follows after a planned or unplanned failure. Businesses often have a secondary datacenter used mostly for backup. If the company has multiple datacenters, they can be used as active/active though.

A secondary datacenter can take responsibility in the case a primary datacenter fails if it is used as a backup.

Recovery time will depend on business requirements. For mission-critical applications, businesses may tolerate very short if not zero downtime.

Then the cost of the required equipment in primary and backup datacenters, skilled engineers who can manage that design, and complexity of the design changes based on the expectation of business from the disaster recovery service.

The amount of data loss a company can tolerate, also known as its recovery point objective (RPO) is a very important parameter. Recovery time can be between 2 hours to days or even weeks, based on the company’s applications.

Highly critical applications require less downtime and less data loss. For that reason, a disaster avoidance solution might be a better option for businesses with many highly critical applications.

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Orhan Ergun

Orhan Ergun, CCIE/CCDE Trainer, Author of Many Networking Books, Network Design Advisor, and Cisco Champion 2019/2020/2021

He created OrhanErgun.Net 10 years ago and has been serving the IT industry with his renowned and awarded training.

Wrote many books, mostly on Network Design, joined many IETF RFCs, gave Public talks at many Forums, and mentored thousands of his students.  

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