Discuss NetApp NS0-593 Exam Topic 9 Question 39

An administrator receives the following error message:

What are two causes for this error? (Choose two.)

AThere Is excessive SSD load causing the wear leveling to become unbalanced.

BA disk is falling.

CThere is excessive SATA HDD load.

DAn SSD disk is performing garbage collection to create a dense data layout.

Suggested Answer: A, D

The error message ''wafl.cp.toolong:error'' indicates that a WAFL consistency point (CP) took longer than 30 seconds to complete. A CP is a process that flushes the data from the NVRAM buffer to the disk.A long CP can cause latency and performance issues for the system1

One possible cause for a long CP is excessive SSD load causing the wear leveling to become unbalanced. Wear leveling is a technique that distributes the write operations evenly across the SSD cells to extend the lifespan of the SSD.If some SSD cells are written more frequently than others, the wear leveling will become unbalanced and the SSD performance will degrade2

Another possible cause for a long CP is an SSD disk performing garbage collection to create a dense data layout. Garbage collection is a process that reclaims the space occupied by invalid or deleted data on the SSD.Garbage collection can improve the write performance and storage efficiency of the SSD, but it can also consume CPU and disk resources and cause long CPs3

A disk failing or being failed is not a likely cause for a long CP, because the system will automatically mark the disk as failed and remove it from the aggregate.The system will also initiate a disk reconstruction or a RAID scrub to restore the data protection and redundancy4

There is no evidence that the system has SATA HDDs, so there is no reason to assume that there is excessive SATA HDD load.Moreover, SATA HDDs are usually used for secondary or backup storage, not for primary or performance-sensitive workloads5

1: Are long Consistency Points (wafl.cp.toolong) normal?- NetApp Knowledge Base2: How to troubleshoot SSD performance issues - NetApp Knowledge Base3: How to troubleshoot SSD garbage collection issues - NetApp Knowledge Base4: How to troubleshoot disk failures and replacements - NetApp Knowledge Base5: ONTAP 9 - Hardware Universe - The Open Group

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26 comments · newest first

Andra 10 months ago

Wait, are we sure about A? That sounds a bit extreme!

Rebbecca 11 months ago

D makes sense too, garbage collection can cause hiccups.

Lajuana 11 months ago

C seems off, SATA HDDs aren't usually the issue here.

Arthur 11 months ago

I think B is more likely, disks do fail sometimes.

Jacqueline 11 months ago

A is definitely a cause, SSDs can get overloaded.

Tracey 12 months ago

Garbage collection on an SSD sounds familiar, but I’m not confident if that’s one of the correct answers for this error.

Dallas 12 months ago

I practiced a question similar to this, and I feel like excessive load on the SSD could be a factor, but I can't recall the details.

Glenn 12 months ago

I think a disk falling could definitely cause an error like this, but I’m not entirely sure about the SSD specifics.

Beula 1 year ago

I remember something about SSD wear leveling, but I'm not sure if that's the main issue here.

Rupert 1 year ago

This seems straightforward to me. I'm going to go with options A and B as the most likely causes based on the information provided.

Yolando 1 year ago

I've seen this type of error before. I think option B is the most likely cause, but I'll double-check the other options just to be sure.

Odette 1 year ago

I'm a bit confused by the technical details here. I'll need to review my notes on SSD and SATA HDD performance to make sure I understand the concepts.

Glen 1 year ago

Okay, the error message mentions something about wear leveling, so that's a good clue. I'll have to consider options A and D.

Tamesha 1 year ago

Hmm, this looks like a tricky one. I'll need to think through the possible causes carefully.

Barbra 1 year ago

Hmm, I'm not sure about this one. I know risk management is important in a lot of industries, but I'm not sure which one is most common. I'll have to think this through carefully.

Cristina 1 year ago

Okay, let's think this through step-by-step. The key seems to be moving the Normal Servers from EAST-IS to NY-IS with the least administrative effort. I'm leaning towards option C, as it seems the most straightforward.

Anabel 1 year ago

I'm pretty sure the answer is Restricted. That's the option that will prevent the deletion of records in Table1 if there are related records in Table2, which is exactly what the question is asking for. I feel good about this one.

Effie 2 years ago

That's a good point. Excessive SATA HDD load could definitely be a factor as well.

Andra 2 years ago

I believe both excessive SSD load and excessive SATA HDD load could be possible causes.

Floyd 2 years ago

I disagree, I think a falling disk could also be a cause of the error.

Effie 2 years ago

I would say the error could be caused by excessive SSD load.

Odette 2 years ago

I also think it could be due to SSD garbage collection creating a dense data layout.

Catrice 2 years ago

I think that's a possibility. Maybe the wear leveling is unbalanced.

Alberta 2 years ago

Could it be caused by excessive SSD load?

Dino 2 years ago

I agree, it seems like a disk-related issue.

Novella 2 years ago

I think the error message is related to the storage devices.

NetApp NS0-593 Exam - Topic 9 Question 39 Discussion