An administrator receives the following error message:
What are two causes for this error? (Choose two.)
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
Your customer is running a NetApp AFF A800 system with NetApp ONTAP 9.8 software and states that their NS224 shelf is not showing with the correct shelf ID. You analyze the data and the shelf shows an identification of ''1.SHFHUXXXXXXXXXX."
What is the cause of the reported Issue?
According to the NetApp Knowledge Base, adding a second NS224 shelf to an existing stack can cause the first shelf ID to change to the serial number if the cables are not connected properly1.This can also result in a Medium Impact error message: Shelves with both connections via the same SAS path detected2. This situation is not normal for a NetApp AFF A800 system and can affect performance and availability.The cables should be reconnected according to the SAS cabling rules and concepts for shelves with IOM12/IOM12B modules3and the controller-to-stack cabling worksheet template for quad-pathed connectivity4.Reference=Shelves with both connections via the same SAS path detected,Adding a second NS224 shelf, changes first shelf ID to the serial number,SAS cabling rules and concepts - shelves with IOM12/IOM12B modules,Controller-to-stack cabling worksheet template for quad-pathed connectivity.
Your customer has deployed a two petabyte NetApp ONTAP FlexGroup volume across their 4-node ONIAP 9.8 cluster. They plan to store over three billion files. They want to prevent file 10 conflicts since files are placed into the FlexGroup volume.
In this scenario, which two NFS SVM parameters should be enabled? (Choose two.)
A customer reports that while Installing Windows updates on their external Vscan servers, clients could not access any files on their CIF-S SVM. The problem disappeared after the update process was completed. The customer wants to prevent this issue from happening during the next patch window.
In this scenario, what are two ways to accomplish this task? (Choose two.)
A customer with an FC MetroCluster configuration that is running NetApp ONTAP 9.8 software experienced a site outage and wants to know why the MetroClusler configuration did not switch over to the other site.
What are two reasons for this problem? (Choose two.)