CV0-003 · Question #426
Given the metric below: Using iSCSI storage reports across three datacenters, which of the following recorded metrics indicates an anomaly in the performance?
The correct answer is D. RAM utilization. RAM utilization is not a standard iSCSI storage performance metric, making its appearance in an iSCSI storage report an anomaly compared to the expected disk and network metrics.
Question
Given the metric below:
Using iSCSI storage reports across three datacenters, which of the following recorded metrics indicates an anomaly in the performance?
Exhibit
Options
- ADisk latency
- BCPU utilization
- CWAN latency
- DRAM utilization
How the community answered
(21 responses)- A5% (1)
- B10% (2)
- C29% (6)
- D57% (12)
Why each option
RAM utilization is not a standard iSCSI storage performance metric, making its appearance in an iSCSI storage report an anomaly compared to the expected disk and network metrics.
Disk latency is a primary iSCSI performance indicator because it measures how quickly the storage target responds to block-level read and write requests.
CPU utilization is relevant to iSCSI because the initiator software consumes CPU cycles to process iSCSI protocol framing, checksums, and TCP/IP offload operations.
WAN latency directly impacts iSCSI throughput and stability when storage is accessed across datacenter boundaries, making it an expected metric in cross-datacenter iSCSI reports.
iSCSI storage performance reports are scoped to block storage over a network and focus on disk latency, CPU overhead for iSCSI initiator processing, and WAN latency between datacenters. RAM utilization is a host compute resource metric with no direct relationship to iSCSI storage operations, so its inclusion in an iSCSI storage report represents an anomalous data point indicating it was likely captured or categorized in error.
Concept tested: iSCSI storage performance metrics and anomaly identification
Source: https://docs.vmware.com/en/VMware-vSphere/7.0/com.vmware.vsphere.storage.doc/GUID-4928680D-B56C-42E8-B00D-48A6E1747E37.html
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