2V0-21.23 Question 30
Single answerA company is designing a virtualized environment for a database application that requires low latency and high throughput for its storage I/O operations. The database also needs to directly access a storage array while maintaining the ability to perform VM-level snapshots and backups. Which technology should the company use for the virtual machine's storage configuration?
- A
Raw Device Mapping (RDM)
- B
Persistent Memory (PMem)
- C
NVMe over Fabrics (NVMe-oF)
- D
Remote Direct Memory Access (RDMA)
Show answer and explanation
Correct answer: A
Explanation
Raw Device Mapping (RDM) is the best choice for this scenario because it enables a virtual machine to directly access a storage array, which can provide the low latency and high throughput needed by the database application. At the same time, RDM supports VM-level features such as snapshots and backups, which are crucial for maintaining data protection and operational flexibility. The other options, while offering specific performance or architectural benefits, do not align with the requirements of this specific use case.
- A. Correct.
Raw Device Mapping (RDM) allows a virtual machine to directly access a storage array while still supporting VM-level operations like snapshots and backups, making it a suitable choice for this scenario.
- B. Incorrect.
Persistent Memory (PMem) provides extremely low-latency access, but it is typically used for in-memory workloads rather than direct access to storage arrays.
- C. Incorrect.
NVMe over Fabrics (NVMe-oF) offers high throughput and low-latency storage access, but it is generally used for shared storage in high-performance environments rather than direct VM-to-storage array configurations.
- D. Incorrect.
Remote Direct Memory Access (RDMA) enhances network performance by enabling direct memory access between systems, but it is not directly applicable for a storage I/O use case like this one.