CompTIA Server+ (SK0-005)Security and Disaster RecoveryMedium
A server administrator is configuring a new storage area network (SAN) for a critical database cluster. To ensure that data written to the primary storage is immediately available on the secondary storage in a remote data center without any data loss in case of a primary site failure, which replication method is required?
- ASynchronous Replication
- BAsynchronous Replication
- CSnapshot Replication
- DFile-level Replication
Show answer & explanationAnswer & explanation
Correct answer: A. Synchronous Replication
Synchronous replication ensures that data is written to both primary and secondary storage simultaneously. The primary system waits for confirmation from the secondary before acknowledging the write, guaranteeing zero data loss (RPO = 0) but potentially introducing latency.
Why the other options are wrong
- B. Asynchronous replication sends data to the secondary after it's committed to the primary, allowing for some data loss (non-zero RPO).
- C. Snapshot replication creates point-in-time copies, not real-time mirroring for continuous operation.
- D. File-level replication operates at the file level and may not provide the real-time, block-level synchronization needed for a critical database without data loss.
Synchronous Replication
A data replication method where data is written to both primary and secondary storage simultaneously, ensuring zero data loss.
- Guarantees RPO of zero.
- Introduces latency due to distance.
- Often used for critical applications with high availability needs.
Memory trick: Replication: Sync for no loss, Async for speed.