CompTIA Cloud+ Practice Test

Which storage replication service allows for eventual consistency due to a delay in data copying?

1. Synchronous

2. Asynchronous

3. Block

4. Tier 1

The correct answer is: Asynchronous

The storage replication service that allows for eventual consistency due to a delay in data copying is asynchronous replication. In an asynchronous replication setup, changes made to the primary storage system are not immediately replicated to the secondary storage system. Instead, data is copied over at scheduled intervals or based on specific triggers, leading to a delay between the initial write operation and the moment the data becomes available on the secondary site. This delayed replication means that there can be a window of time during which the primary and secondary systems do not reflect the same data state. Therefore, if a failure occurs during this window, the most recent data may only exist on the primary system, resulting in potential data loss scenarios or inconsistent views of the data across sites. This characteristic is essential for organizations that may prioritize performance and bandwidth efficiency over obtaining real-time data consistency. In contrast, synchronous replication ensures that data is written to both primary and secondary systems simultaneously, which maintains immediate data consistency but may introduce performance overhead and latency challenges. Block storage and tier 1 refer to different types of storage methodologies and levels of service quality, rather than directly pertaining to the consistency model associated with replication.