1Y0-401 · Question #375
Why should disk queue length above zero be used to identify bottlenecks?
The correct answer is A. This indicates excessive I/O and a disk bottleneck.. A disk queue length above zero indicates that the disk subsystem has pending I/O requests, signifying a bottleneck where the disk cannot process all requests immediately.
Question
Options
- AThis indicates excessive I/O and a disk bottleneck.
- BThis indicates excessive swap file utilization.
- CThis indicates insufficient RAM.
- DThis indicates a failed disk.
How the community answered
(32 responses)- A91% (29)
- B6% (2)
- D3% (1)
Why each option
A disk queue length above zero indicates that the disk subsystem has pending I/O requests, signifying a bottleneck where the disk cannot process all requests immediately.
A disk queue length greater than zero directly signifies that the disk subsystem is unable to process all incoming I/O requests immediately, leading to a backlog of operations and indicating that the disk itself is a performance bottleneck.
Excessive swap file utilization is a cause that can lead to high disk I/O and a longer disk queue, but it is not the indicator itself of a disk bottleneck.
Insufficient RAM is a cause that often leads to increased page file usage and subsequent higher disk I/O, but it is not the direct metric for identifying a disk bottleneck; disk queue length directly measures disk activity.
A disk queue length above zero indicates performance contention or slowness, not that the disk has physically failed.
Concept tested: Disk queue length performance metric
Source: https://learn.microsoft.com/en-us/windows-server/administration/performance-monitor/monitor-disk-performance
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