A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following output: Given there is a single CPU in the sever, which of the…

The correct answer is B. The CPU is overloaded. With a single CPU, a tool like vmstat or top would show CPU metrics including wa (I/O wait). High I/O wait on a single CPU means the one CPU is spending most of its time waiting for disk I/O to complete, effectively making it overloaded. The I/O bottleneck manifests as CPU…

Troubleshooting

Question

A Linux administrator was notified that a virtual server has an I/O bottleneck. The Linux administrator analyzes the following output:

Given there is a single CPU in the sever, which of the following is causing the slowness?

Exhibit

Options

AThe system is running out of swap space.
BThe CPU is overloaded.
CThe memory is exhausted.
DThe processes are paging.

How the community answered

(22 responses)

A
14% (3)
B
73% (16)
C
9% (2)
D
5% (1)

Explanation

With a single CPU, a tool like vmstat or top would show CPU metrics including wa (I/O wait). High I/O wait on a single CPU means the one CPU is spending most of its time waiting for disk I/O to complete, effectively making it overloaded. The I/O bottleneck manifests as CPU overload because the single processor cannot efficiently handle the volume of I/O requests queued against it. The other options (swap exhaustion, memory exhaustion, paging) would typically show different indicators in the output.

Topics

#Performance Troubleshooting#CPU Management#I/O Management#System Monitoring

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