Question

Identify and evaluate 2 options for disaster recovery. Compare and contrast the strengths and weaknesses of each option,

Answer 1

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Option No. 1 Synchronous Replication

Also known as active/active replication, real-time ("live") copies of your data are created and stored offsite. In the event of a disaster or system failure, key systems fail over to the back-up site, keeping downtime and data loss to an absolute minimum.

Your disaster recovery site should be geographically diverse from your main data center. Too many businesses located in the World Trade Center in New York discovered the problem with locating their data center in the building next door

Pros

• Little to no downtime. Recovery time is typically a function of boot time/order and any requisite DNS/routing changes. (Best RTO)

• Can be configured for automatic failover. No loss of time due to manual switching

• Little to no data loss. Data is always current as the back-up site is always active. (Best RPO)

Cons

• Requires extra equipment and software. (Highest cost)

• Requires reliable (redundant) network connectivity between locations.

• Increased complexity. Need to manage both sites and the connection between them.

Option No. 2 Asynchronous Replication

Asynchronous replication, also known as active/passive replication, or a warm site, refers to a disaster recovery strategy where near-real-time copies of your data are created and stored offsite, either at a service provider’s data center or at a second company location. Both synchronous and asynchronous replication strategies require a robust architecture that includes reliable connectivity between the primary and secondary sites. The desired RPO and the amount of data being modified will affect connectivity requirements.

Pros

• Data is replicated continually. However, unlike synchronous replication, activity at the primary site does not have to wait for the copy to complete to the disaster recovery site in order to continue.

• Utilizing snapshots allows you to replicate data on a scheduled basis at the time interval you specify.

• No data restore is needed. After a disruptive event, replica data becomes active. (RTO/RPO second only to synchronous option)

Cons

• Equipment costs are high to medium.

• Potential for some data loss. Data is only current to last replication point.

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