NetApp NS0-593 NetApp certified support engineer - ONTAP specialist Exam Practice Test

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Total 60 questions
Question 1

You have a customer complaining of long build times from their NetApp ONTAP-based datastores. They provided you packet traces from the controller and client. Analysis of these traces shows an average service response time of 1 ms. QoS output confirms the same. The client traces are reporting an average of 15 ms in the same time period.

In this situation, what would be your next step?



Answer : B

The question describes a scenario where the controller and client have a significant difference in their reported latency for the same datastores.

The controller's latency is 1 ms, which is within the normal range for ONTAP-based datastores1.

The client's latency is 15 ms, which is much higher than the controller's latency and could indicate a performance issue on the client side2.

Therefore, the next step is to investigate the client that reports high latency and identify the possible causes, such as network congestion, misconfiguration, resource contention, or application issues23.

The other options are not relevant or appropriate for this scenario, because:

A) The cluster is not responding slowly, as the controller's latency is low and QoS output confirms the same.

C)The cluster interconnects are not likely to be the cause of the latency difference, as they are used for communication between nodes within the cluster, not between the controller and the client4.

D)A sync core is a diagnostic tool that captures the state of the system at a given point in time, and is not a troubleshooting step for performance issues5.Reference:

ONTAP 9 Performance - Resolution Guide - NetApp Knowledge Base

Performance troubleshooting - NetApp

How to troubleshoot performance issues in Data ONTAP 8 7-mode

Cluster interconnect network - NetApp

How to generate a sync core on a node - NetApp


Question 2

The motherboard of Node-01 is being replaced. To perform this task, a takeover was Initiated from Node-02. Node-02 panics showing the string below.

PANIC; Permanent errors on all HA mailbox disks (while marshalling header) in SKprocess fnmbx_instanceWorker on release 9.5P8 (C)

What has happened in this situation?



Answer : D

The mailbox disks are the first two disks of the root aggregate on each node of an HA pair. They store the HA state information and the panic dump files.The mailbox disks are used for communication between the HA partners and for takeover and giveback operations1

The mailbox destroy local command is used to destroy the mailbox disks on the local node. This command is only available in maintenance mode and should be used with extreme caution.The command is intended for situations where the mailbox disks are corrupted or inaccessible and need to be recreated2

If the mailbox destroy local command is executed on a node that is in takeover mode, the node will panic with the message ''Permanent errors on all HA mailbox disks''.This is because the node will lose the HA state information and the panic dump files of the partner node, and will not be able to communicate with the partner node or perform a giveback operation3

Therefore, if the motherboard of Node-01 is being replaced, and a takeover was initiated from Node-02, and Node-02 panics showing the string ''Permanent errors on all HA mailbox disks'', the most likely cause is that the mailbox destroy local command was executed on Node-02 while in maintenance mode.This is a serious error that can result in data loss and system downtime4


1: ONTAP 9 - High-Availability Configuration Guide - The Open Group2: ONTAP 9 - Commands: Manual Page Reference - The Open Group3: How to troubleshoot a ''Permanent errors on all HA mailbox disks'' panic - NetApp Knowledge Base4: One node PANIC : Permanent errors on all HA mailbox disks - NetApp Knowledge Base

Question 3

Your customer wants to access a LUN on a FAS 8300 system from a VMware ESXi server through the FC protocol. They already created a new SVM, volume. LUN, and igroup for this purpose. The customer reports that the server's FC HBA port Is online, but the LUN does not show up.

Referring to the exhibit, what is the reason for this problem?



Answer : A

To access a LUN on a FAS 8300 system from a VMware ESXi server through the FC protocol, the customer must configure the FC service on the SVM that owns the LUN. The FC service enables the SVM to act as an FC target and communicate with the FC initiators on the host. Without the FC service, the LUN will not be visible to the host, even if the LUN is mapped to an igroup and the FC LIFs are up. The exhibit shows that the FC service is not configured on the SVM, as the output of the commandvserver fcp initiator show -vserver SVM1is empty. Therefore, the reason for the problem is that the FC service has not been configured on the SVM.Reference=Configure an SVM for FC,Create an FC protocol service,Single IQN iSCSI session with ESXi on ONTAP when igroup has two IQNs


Question 4

You recently discovered the error message shown below in your ONTAP logs.

What should be your first action to correct this Issue?



Answer : B

= The error message indicates that the volume my_data_vol is WAFL inconsistent, which means that there is a discrepancy between the data blocks and the metadata in the file system. This can be caused by various factors, such as hardware failures, software bugs, power outages, or network disruptions.The first action to correct this issue is to determine the root cause behind the inconsistency before attempting any recovery procedure, as recommended by the NetApp documentation1. This is because some recovery procedures, such as wafliron or storage takeover, may not work or may cause further damage if the underlying cause is not resolved. For example, if the inconsistency is due to a faulty disk or shelf, running wafliron may not fix the problem and may even corrupt more data.Therefore, it is important to identify and isolate the cause of the inconsistency before taking any further steps.Reference=1Volume Showing WAFL Inconsistent - NetApp Knowledge Base


Question 5

You have a 4-node NetApp ONTAP 9.8 cluster with an AFF A400 HA pair and a FAS8300 HA pair with 16 TB NL-SAS drives. You are asked to automatically tier 150 TB of Snapshot copy data from the AFF A400 aggregates to the FAS8300.

In this scenario, which ONTAP license must be added to the cluster to accomplish this task?



Answer : D

FabricPool is an ONTAP feature that enables tiering of cold data from SSD aggregates to low-cost object storage, either on-premises or in the cloud1.FabricPool requires a license to be installed on the cluster, and the license type depends on the cloud tier being used2.In this scenario, the cloud tier is another ONTAP cluster (FAS8300), which is not supported by the new Cloud Tiering license that is used for most FabricPool configurations3.Therefore, the old FabricPool license that is retained for dark sites or MetroCluster systems using FabricPool Mirror must be used3.The FabricPool license defines the amount of capacity that can be tiered to the cloud tier, and it can be increased by add-on orders4.Reference:

1: FabricPool overview5

2: FabricPool requirements6

3: Install a FabricPool license2

4: ONTAP FabricPool (FP) Licensing Overview1


Question 6

Your customer Informs you about SnapMlrror problems after upgrading NetApp ONTAP software to a newer version. After investigating the event logs and the SnapMirror history, you see information about delayed updates of the SnapMirror relationships.

How would your customer prevent such problems in the future?



Answer : A

Quiescing the SnapMirror relationships before upgrading the ONTAP software ensures that the data replication is completed and consistent across the source and destination volumes. This prevents any data loss or corruption due to the upgrade process. Quiescing also suspends the scheduled updates until the relationships are resumed, avoiding any delays or failures in the transfers. The other options are not effective in preventing the SnapMirror problems after the upgrade.Reference= https://docs.netapp.com/us-en/ontap/upgrade/concept_upgrade_requirements_for_snapmirror.html

https://docs.netapp.com/us-en/ontap-systems-upgrade/upgrade-arl-auto-app/resume_snapmirror_operations.html


Question 7

An administrator receives the following error message:

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



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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