NS0-157 Question #87: Real Exam Question with Answer & Explanation

The correct answer is A: node CPU utilization. iSCSI LUN latency is affected by the processing node's CPU load and the underlying Ethernet network, since iSCSI is an IP-based protocol that runs entirely over Ethernet infrastructure.

Performance, Troubleshooting, and Security

Question

A customer has LUNs that are being accessed through iSCSI. The applications have experienced increased LUN latency over the last couple of days. Which two components should you review to determine what caused the rise in latency? (Choose two.)

Options

Anode CPU utilization
BFC switch performance
CEthernet network performance
Dcluster management switch performance

Explanation

iSCSI LUN latency is affected by the processing node's CPU load and the underlying Ethernet network, since iSCSI is an IP-based protocol that runs entirely over Ethernet infrastructure.

Common mistakes.

B. FC switch performance is irrelevant for iSCSI because iSCSI uses Ethernet and TCP/IP, not Fibre Channel - FC switches carry FCP traffic, not iSCSI traffic.
D. The cluster management switch carries only out-of-band management traffic such as SSH and HTTPS sessions and has no role in carrying iSCSI data traffic, so its performance does not affect LUN latency.

Concept tested. iSCSI LUN latency troubleshooting - CPU and Ethernet impact

Reference. https://docs.netapp.com/us-en/ontap/san-admin/iscsi-concept.html

Topics

#iSCSI#LUN latency#performance troubleshooting#Ethernet network

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