CompTIA Server+ (SK0-005)Security and Disaster RecoveryHard
A large enterprise is designing a robust backup and disaster recovery strategy. For their most critical applications, they require continuous data protection with minimal potential for data loss and the ability to replicate data across geographically dispersed data centers in real-time. Which replication method is best suited for this requirement?
- ASnapshot Replication
- BAsynchronous Replication
- CTape Backup Replication
- DSynchronous Replication
Show answer & explanationAnswer & explanation
Correct answer: D. Synchronous Replication
Synchronous replication ensures that data is written to both the primary and secondary storage systems simultaneously. The primary system waits for confirmation from the secondary before acknowledging the write to the application, guaranteeing zero data loss (RPO = 0) at the cost of potential latency, which is acceptable for critical applications requiring minimal data loss and real-time replication.
Why the other options are wrong
- A. Snapshot replication captures point-in-time images, not continuous real-time data protection.
- B. Asynchronous replication offers lower latency but can result in some data loss (non-zero RPO) as writes are not confirmed immediately.
- C. Tape backup replication involves transporting tapes, which does not provide real-time, continuous data protection.
Synchronous Replication
A data replication method where data is written to both the primary and secondary storage systems simultaneously, ensuring zero data loss (RPO = 0) at the expense of potential latency.
- Guarantees RPO = 0 (zero data loss).
- Primary system waits for confirmation from secondary.
- Introduces latency, typically used over short distances.
Memory trick: Sync is instant copy, Async is delayed copy.