Question
An OS administrator is reporting slow storage throughput on a few VMs in a private IaaS cloud. Performance graphs on the host show no increase in CPU or memory. However, performance graphs on the storage show a decrease of throughput in both IOPS and MBps but not much increase in latency. There is no increase in workload, and latency is stable on the NFS storage arrays that are used by those VMs. Which of the following should be verified NEXT?
A. Application
B. SAN
C. VM GPU settings
D. Network
Answer
D. Network
Explanation
The correct answer is D. Network.
The network is the most likely cause of the slow storage throughput on the VMs in a private IaaS cloud, given the information provided in the question. The network is the medium that connects the VMs to the NFS storage arrays, and any issues with the network configuration, bandwidth, or congestion can affect the storage performance.
The other options are incorrect because:
- A. Application. This is false because the application is not likely to cause slow storage throughput on the VMs, as the performance graphs on the host show no increase in CPU or memory. This indicates that the application workload is not consuming more resources than usual, and therefore, not affecting the storage performance.
- B. SAN. This is false because the SAN is not involved in this scenario, as the VMs are using NFS storage arrays, which are part of a NAS (network-attached storage) system. A SAN (storage area network) is a different type of storage system that uses block-level protocols, such as iSCSI or Fibre Channel, to connect to the VMs. A NAS system uses file-level protocols, such as NFS or SMB, to connect to the VMs.
- C. VM GPU settings. This is false because the VM GPU settings are not likely to cause slow storage throughput on the VMs, as they are related to the graphics processing unit (GPU) of the VMs, not the storage device. The GPU settings can affect the graphics performance of the VMs, such as rendering or video processing, but not the storage performance.
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Alex Lim
Alex Lim is a certified IT Technical Support Architect with over 15 years of experience in designing, implementing, and troubleshooting complex IT systems and networks. He has worked for leading IT companies, such as Microsoft, IBM, and Cisco, providing technical support and solutions to clients across various industries and sectors. Alex has a bachelor’s degree in computer science from the National University of Singapore and a master’s degree in information security from the Massachusetts Institute of Technology. He is also the author of several best-selling books on IT technical support, such as The IT Technical Support Handbook and Troubleshooting IT Systems and Networks. Alex lives in Bandar, Johore, Malaysia with his wife and two chilrdren. You can reach him at [email protected] or follow him on Website | Twitter | Facebook
