To minimize WAN impact when creating a secondary datacenter for failover, which replication strategy is preferred?

To minimize WAN impact when creating a secondary datacenter for failover, which replication strategy is preferred?

• A. Asynchronous replication
• B. Storage deduplication
• C. Cold site failover with offsite archiving
• D. Site mirroring

Answer: (A)

Minimizing WAN impact while setting up a secondary datacenter for failover is best achieved with asynchronous replication. This approach sends replication updates after they’re committed at the primary site, allowing traffic to be batched, compressed, and throttled. You can schedule transfers during off-peak times and cap the bandwidth used, so the production environment isn’t slowed and the WAN isn’t saturated. It also provides flexibility to meet specific RPO targets without demanding a constant, high-bandwidth link. In contrast, synchronous replication requires immediate acknowledgment from the remote site for every write, which means a continuous, high-bandwidth, low-latency connection and can drastically affect WAN usage. A cold site with offsite archiving involves periodic data transfers and offline recovery, leading to longer downtime and a weaker immediate failover capability. Site mirroring aims to keep two sites in real-time sync, which is typically the most bandwidth-intensive option.

Minimizing WAN impact while setting up a secondary datacenter for failover is best achieved with asynchronous replication. This approach sends replication updates after they’re committed at the primary site, allowing traffic to be batched, compressed, and throttled. You can schedule transfers during off-peak times and cap the bandwidth used, so the production environment isn’t slowed and the WAN isn’t saturated. It also provides flexibility to meet specific RPO targets without demanding a constant, high-bandwidth link.

In contrast, synchronous replication requires immediate acknowledgment from the remote site for every write, which means a continuous, high-bandwidth, low-latency connection and can drastically affect WAN usage. A cold site with offsite archiving involves periodic data transfers and offline recovery, leading to longer downtime and a weaker immediate failover capability. Site mirroring aims to keep two sites in real-time sync, which is typically the most bandwidth-intensive option.