Refer to the Exhibit. An administrator is using the esxtop command to troubleshoot storage performance issues on a virtual machine. The esxtop capture is shown in the Exhibit. Based on the exhibit…

Question

Exhibit

Options

• AThe iSCSI device is experiencing high latency.
• BThe ESXi kernel is experiencing high latency.
• CThe Guest OS is experiencing high latency and response time.
• DThe NFS device is experiencing high latency.

• A
  65% (20)
• B
  10% (3)
• D
  26% (8)

Explanation

The esxtop storage view reports latency broken into three components: DAVG (Device Average latency - time spent at the physical storage device/HBA), KAVG (Kernel Average latency - time spent processing in the VMkernel storage stack), and GAVG (Guest Average latency - the total latency as seen by the guest OS, which equals DAVG + KAVG). In the exhibit, the iSCSI device shows an elevated DAVG value, indicating the physical iSCSI storage device itself is the bottleneck - making statement A true. Because GAVG is the sum of DAVG and KAVG, a high DAVG directly causes a high GAVG, meaning the guest OS is experiencing high overall latency and degraded response time - making statement C true. Statement B is incorrect because KAVG (ESXi kernel latency) is shown as low/normal in the exhibit, ruling out the kernel as the source of the problem. Statement D is incorrect because the device shown in the exhibit is iSCSI, not NFS.

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