CompTIA Exam SK0-005 Topic 1 Question 50 Discussion

Actual exam question for CompTIA's SK0-005 exam

Question #: 50
Topic #: 1

A technician replaces a single faulted disk in the following array RAID 10, Four 15K SAS HDD The technician replaces it from a disk in spare parts, and the array rebuilds the data in a few minutes. After the array rebuild is complete, the system reports the IOPS on the disk array have dropped by almost 60% Which of the following should the technician investigate first?

ACheck the RAID controller (or background rebuild tasks

BCheck the firmware version on the newly replaced disk.

CCheck the RPM speed on the newly replaced disk-

DCheck the cache settings on the RAID controller.

Show Suggested Answer

Suggested Answer: C

In RAID 10 arrays, disk performance is crucial, especially if they are high-speed 15K RPM SAS HDDs, as each disk in the array is part of a mirrored pair that also stripes data with another pair. When replacing a disk, it's essential that the new disk matches the specifications of the others, especially in terms of rotational speed (RPM). If the replaced disk is slower, it can significantly reduce the Input/Output operations per second (IOPS) of the entire array. This is because all disks need to work in tandem, and the slowest disk can become a bottleneck. Thus, checking the RPM of the newly replaced disk is a sensible first step to ensure it matches the performance of the other disks in the array.

by Galen at Apr 14, 2024, 07:36 PM

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Shenika

5 months ago

Yes, checking all these factors is important to pinpoint the root cause of the performance drop.

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Jin

5 months ago

We should also consider checking the cache settings on the RAID controller. It could be affecting performance.

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Joanne

5 months ago

That's a good point. Firmware issues can definitely cause performance problems.

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Lorrie

6 months ago

But what about checking the firmware version on the replaced disk? Maybe it's not compatible.

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Shenika

6 months ago

Yeah, if the IOPS dropped so significantly, it could be a controller issue.

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Jin

6 months ago

I think we should check the RAID controller first.

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Lilli

6 months ago

I think we should also check the cache settings on the RAID controller, that could be causing the drop in performance.

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Tyisha

6 months ago

That could be a good idea too, the issue might be related to the firmware.

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Brigette

6 months ago

But what about checking the firmware version on the newly replaced disk?

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Tamra

7 months ago

I agree, the drop in IOPS could be related to the RAID controller.

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Tyisha

7 months ago

I think we should investigate the RAID controller first.

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Lawana

8 months ago

Wait, wait, wait. Did anyone consider the RAID controller's cache settings? If those got messed up during the rebuild, that could also lead to a major IOPS drop. Definitely worth checking out.

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Leota

8 months ago

You know, I'm just curious, has anyone ever tried turning the RAID array off and back on again? That's like the IT version of 'have you tried turning it off and on again?'

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Lonna

7 months ago

D) Check the cache settings on the RAID controller.

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Shalon

8 months ago

C) Check the RPM speed on the newly replaced disk.

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Lashawnda

8 months ago

B) Check the firmware version on the newly replaced disk.

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Reynalda

8 months ago

A) Check the RAID controller (or background rebuild tasks

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Jaime

8 months ago

Yeah, that's like the IT version of 'have you tried turning it off and on again?'

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Elouise

8 months ago

Have you tried turning the RAID array off and back on again?

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Stephanie

8 months ago

Hmm, I don't know. The firmware version might be a good place to start too. If it's not compatible with the array, that could definitely cause some issues.

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Casandra

8 months ago

Hmm, good point. The cache settings on the RAID controller are definitely worth investigating. We don't want to overlook the obvious.

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Jolanda

8 months ago

True that, Dusti. Though I guess we'll have to wait and see what the technician finds. I just hope they don't end up having to replace the whole array. That would be a real headache.

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Latrice

8 months ago

Hold on, what if it's a caching issue with the RAID controller? That could also cause a significant IOPS drop.

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Galen

7 months ago

Maybe we should also check the firmware version on the newly replaced disk, just to be thorough.

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Jimmie

7 months ago

But could it also be related to the RPM speed of the replaced disk?

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Ettie

7 months ago

That's a good point. We should check the cache settings on the RAID controller.

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Dusti

8 months ago

Haha, good point David. Though if I had to bet, I'd still put my money on the RPM speed. Can't beat good old-fashioned raw performance, am I right?

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Gerardo

8 months ago

Yeah, I'm leaning towards checking the RPM speed on the new disk. That could definitely impact the overall IOPS of the array.

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Lavera

8 months ago

I think it might have something to do with the new disk that was used to replace the faulted one. The firmware version or RPM speed could be the culprit.

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Rozella

8 months ago

Wow, this question is tricky! I'm not sure what to make of it. The IOPS drop by 60% after the rebuild, so something is definitely going on.

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