CompTIA SK0-005 Exam - Topic 2 Question 84 Discussion

Actual exam question for CompTIA's SK0-005 exam

Question #: 84
Topic #: 2

A technician receives reports that a file server is performing slower than usual after a power failure. While investigating the issue, the technician discovers the write cache was disabled. The technician checks a server configuration document and confirms the cache was previously enabled. Which of the following events most likely caused this change?

AThe cache hit rate was high

BThe volume reached 100% capacity

CThe RAID controller battery failed

DA drive in the array was replaced

Show Suggested Answer

Suggested Answer: C

Comprehensive and Detailed

Write caching improves disk performance by temporarily storing write operations in faster cache memory before writing to disk. However, to prevent data loss during power failures, write caching relies on a battery-backed cache. If the RAID controller's battery fails, the system may automatically disable write caching to protect data integrity, leading to reduced performance.

by Barrett at Nov 19, 2025, 09:10 PM

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Xuan

1 month ago

I see the logic in C, but B is also a possibility if the server was overloaded.

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Lizette

2 months ago

I lean towards C as well. It's a common issue after power failures.

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Val

2 months ago

True, but the cache being disabled points more to C.

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Donte

2 months ago

But what about B? If the volume is full, it could impact performance too.

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Dortha

2 months ago

Agreed, C makes sense. Without power, the cache can't function.

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Tamie

2 months ago

Definitely not the cache hit rate, that doesn’t change settings.

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Asuncion

2 months ago

Wait, could it be the drive replacement? That seems unlikely.

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Lindsey

3 months ago

I agree, that’s a common issue after power failures.

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Breana

3 months ago

I bet the technician was the one who forgot to enable the cache. Classic tech support move right there.

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Laura

3 months ago

Haha, the server was just tired of working so hard and decided to take a break. Disabled the cache, put its feet up, and had a coffee break.

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Kanisha

4 months ago

B) The volume reached 100% capacity. Gotta free up some space, am I right?

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Jani

4 months ago

D) A drive in the array was replaced. That would definitely trigger a cache disable to protect data integrity.

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Rachael

4 months ago

I’m kind of confused about the options. Could replacing a drive really cause the cache to be disabled? That seems a bit off to me.

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Lindsay

4 months ago

This reminds me of a practice question where a similar scenario involved a RAID controller issue. I think the battery failing is a strong possibility here.

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Slyvia

4 months ago

I’m not entirely sure, but I think if the volume reached 100% capacity, it could affect performance too.

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Reynalda

4 months ago

I remember something about RAID controllers and how a battery failure can lead to cache being disabled. That might be the answer.

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Phil

5 months ago

I think I've got it. The RAID controller battery failing is the most likely explanation, since that would cause the write cache to be disabled as a safety measure. I'll go with option C.

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Junita

5 months ago

The cache hit rate being high doesn't seem like it would cause the write cache to be disabled, so I'm leaning towards either the RAID controller battery or a drive replacement as the culprit.

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Edna

5 months ago

I'm a bit confused here. Could it also be related to the volume capacity reaching 100%? I'm not sure how that would impact the write cache.

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Meaghan

5 months ago

I think C is the most likely cause. A failed battery would disable the cache.

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Vivan

5 months ago

C) The RAID controller battery failed. That's the most likely cause for the write cache being disabled.

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Temeka

6 months ago

100% capacity could cause issues, but not cache settings.

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Ressie

6 months ago

Sounds like the RAID controller battery might have failed.

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Jackie

6 months ago

Okay, let's see. The write cache was disabled, so that's the key issue. I'm guessing it's related to a hardware problem, like the RAID controller battery failing.

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