2V0-621 · Question #152
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, wh
The correct answer is A. The iSCSI device is experiencing high latency. C. The Guest OS is experiencing high latency and response time.. esxtop exposes storage latency at the device (DAVG), kernel (KAVG), and guest (GAVG) layers independently. The exhibit shows elevated DAVG on the iSCSI adapter, which directly elevates GAVG and the response time experienced by the guest OS.
Question
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, which two statements are true? (Choose two.)
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.
How the community answered
(63 responses)- A52% (33)
- B32% (20)
- D16% (10)
Why each option
esxtop exposes storage latency at the device (DAVG), kernel (KAVG), and guest (GAVG) layers independently. The exhibit shows elevated DAVG on the iSCSI adapter, which directly elevates GAVG and the response time experienced by the guest OS.
The exhibit shows high DAVG/cmd values for the iSCSI storage adapter, indicating the iSCSI device itself is responding slowly and is the primary source of latency in the I/O path.
KAVG/cmd values in the exhibit fall within an acceptable range (typically below 2ms), indicating the ESXi VMkernel is not introducing significant scheduling or queuing latency.
GAVG/cmd represents the total latency experienced by the guest OS and is calculated as DAVG plus KAVG; because DAVG is high, the guest OS inherits that elevated response time, confirming that the guest is experiencing high latency and degraded I/O performance.
The high-latency device identified in the exhibit is an iSCSI adapter, not an NFS mount; no NFS-specific counters in the exhibit indicate elevated latency.
Concept tested: esxtop storage latency counters DAVG KAVG GAVG interpretation
Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.monitoring.doc/GUID-A7B10A42-B8D3-4B8E-BEFE-0F0C8E2E7C3D.html
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