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NetApp Exam NS0-593 Topic 9 Question 39 Discussion

Actual exam question for NetApp's NS0-593 exam
Question #: 39
Topic #: 9
[All NS0-593 Questions]

An administrator receives the following error message:

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

Show Suggested Answer Hide Answer
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

by Portia at Feb 09, 2024, 02:39 AM

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Effie
5 months ago
That's a good point. Excessive SATA HDD load could definitely be a factor as well.
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Andra
5 months ago
I believe both excessive SSD load and excessive SATA HDD load could be possible causes.
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Floyd
5 months ago
I disagree, I think a falling disk could also be a cause of the error.
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Effie
5 months ago
I would say the error could be caused by excessive SSD load.
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Odette
5 months ago
I also think it could be due to SSD garbage collection creating a dense data layout.
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Catrice
6 months ago
I think that's a possibility. Maybe the wear leveling is unbalanced.
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Alberta
6 months ago
Could it be caused by excessive SSD load?
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Dino
6 months ago
I agree, it seems like a disk-related issue.
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Novella
6 months ago
I think the error message is related to the storage devices.
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