2V0-21.23 Question 29
Single answerA company is designing a virtualized environment for a database application that requires direct access to underlying storage to meet low-latency and high-throughput requirements. Additionally, the application must support snapshots and backups at the storage layer. Which technology should be used to meet these requirements?
- A
Raw Device Mapping (RDM)
- B
Persistent Memory (PMem)
- C
NVMe over Fabrics (NVMe-oF)
- D
Remote Direct Memory Access over iSCSI (iSER)
Show answer and explanation
Correct answer: A
Explanation
Raw Device Mapping (RDM) is the best choice for this scenario because it provides direct access to physical storage for low-latency and high-throughput requirements while retaining the ability to use features like snapshots and backups at the storage layer. Other technologies like PMem, NVMe-oF, and iSER are designed for different use cases and do not fully meet the application's requirements for storage access and backup capabilities.
- A. Correct.
Raw Device Mapping (RDM) allows a virtual machine to directly access a physical storage device, providing low-latency and high-throughput while still supporting features like snapshots and backups at the storage layer. This makes it suitable for applications requiring direct access to storage.
- B. Incorrect.
Persistent Memory (PMem) is typically used for extremely high-speed memory access with data persistence, but it does not support features like snapshots and backups at the storage layer. It is not an ideal match for this scenario.
- C. Incorrect.
NVMe over Fabrics (NVMe-oF) is designed for high-performance storage over networks, but it focuses on remote storage access and does not natively support snapshot or backup features at the storage layer.
- D. Incorrect.
Remote Direct Memory Access over iSCSI (iSER) accelerates iSCSI storage by reducing CPU overhead and improving performance, but it does not provide direct access to a storage device with support for snapshots and backups at the storage layer.