NS0-593 Exam Dumps - NetApp Certified Support Engineer ONTAP Specialist

= ONTAP Select supports REST and Ansible as automation methods. REST is the primary foundation for the automation technologies, and Ansible is a popular tool for automating ONTAP Select deployments using roles and playbooks. References = ONTAP Automation documentation, Automate ONTAP Select deployments with Ansible

• The question refers to a scenario where the shelf firmware for an NS224 shelf has not been upgraded on one of the NVMe shelf modules (NSM) after a week of installation.
• The NSM is responsible for managing the communication between the drives and the I/O modules (IOM) in the shelf1.
• The shelf firmware for the NSM is automatically updated when the NSM is inserted into the shelf or when the system is rebooted2.
• If the automatic update does not work, the manual update process involves reseating the NSM, which means removing it from the shelf and inserting it back3.
• Reseating the NSM triggers the firmware update and also resets the NSM’s state3.
• The other options are not correct, because:
• NS224 NVMe drive shelf overview - NetApp
• Shelf firmware update process - NetApp
• Module firmware upgrade stuck on NS224 shelf - NetApp Knowledge Base
• Power cycle a disk shelf - NetApp

The error message indicates that the specified path “/vol1” does not exist in the namespace belonging to Vserver “svm1”. This means that the volume “vol1” has not been mounted to the Vserver’s namespace, which is required for creating a share. The volume type, the CIFS service status, and the CIFS service mode are not relevant to the error. References = https://www.netapp.com/support-and-training/netapp-learning-services/certifications/support-engineer/

https://mysupport.netapp.com/site/docs-and-kb

According to the SAS cabling rules and concepts for shelves with IOM12/IOM12B modules1, one of the goals is to provide a single, easily understood universal algorithm for all SAS products and configurations. One of the rules is that of the two paths to a single disk storage stack from a single node, one should connect to the top and one to the bottom of the storage stack. This ensures maximum possible resilience and minimizes the reliance on controller takeovers. The exhibit shows that both SAS connections from one controller go to the same shelf, which violates this rule and causes the error message. This situation is not normal for a FAS2750 single-node system and can reduce reliability and availability. The cables should be reconnected according to the SAS cabling rules and the controller-to-stack cabling worksheet template for quad-pathed connectivity2. References = SAS cabling rules and concepts - shelves with IOM12/IOM12B modules, SAS cabling issue: Both SAS connections from one controller go to the same shelf, Controller-to-stack cabling worksheet template for quad-pathed connectivity.

= A user quota is a limit on the amount of disk space or the number of files that a user can consume on a volume. A user can be represented by multiple IDs, such as UNIX user ID (UID), Windows user ID (SID), or name mapping ID. A file owned by any of these IDs is subject to the restriction of the user quota. If a user has files in different directories or qtrees within the same volume, all of those files count towards the user’s quota limit. Therefore, if other files within the volume are also owned by the user, they could exceed the user quota and prevent the user from saving more files to their home drive, even if the home drive itself shows minimal data usage. References = How quotas work with users and groups overview, ONTAP - How quotas work with users and groups

= To prevent file ID conflicts in a FlexGroup volume, you need to enable 64-bit NFSv3 and NFSv4 identifiers on the SVM that hosts the FlexGroup volume. This allows the SVM to use 64-bit file system IDs (FSIDs) and file IDs, which are unique across the cluster and can accommodate a large number of files. The -v3-64bit-identifiers and -v4-64bit-identifiers parameters enable this feature for NFSv3 and NFSv4 protocols respectively. References = Editing FlexGroup volumes, Enabling 64-bit NFSv3 identifiers on an SVM, NetApp ONTAP FlexGroup volumes — Best practices and implementation guide

 To enable DDNS updates to work, two actions should be performed:

• Remove the NFS protocol from the cifs_01 data LIF. This is because DDNS updates are only supported for LIFs that have only one data protocol enabled1. The cifs_01 LIF has both NFS and CIFS protocols enabled, which prevents it from registering its DNS record dynamically. By removing the NFS protocol from the cifs_01 LIF, it will become eligible for DDNS updates.
• Enable the -is-enabled parameter for the SVM DDNS services. This is because the -is-enabled parameter controls whether the SVM sends DDNS updates to the DNS servers2. The exhibit shows that the -is-enabled parameter is set to false for the svm1 SVM, which means that it does not send any DDNS updates. By enabling the -is-enabled parameter, the SVM will start sending DDNS updates for its eligible LIFs. References:
• 1: Configure dynamic DNS services3
• 2: Manage DNS/DDNS services with System Manager4

 To create a packet trace for all clients on the 192.168.9.0/24 subnet, you have to run the packet trace on the interface that has an IP address in the same subnet. According to the exhibit, the only interface that matches this criterion is e2a-100, which has an IP address of 192.168.3.1/24. The other interfaces have IP addresses in different subnets, such as 10.92.4.202/16, 10.91.3.132/24, 10.95.7.114/24, and 10.92.6.200/16. Therefore, the correct answer is B. e2a-100. References = How to capture packet traces on ONTAP 9.10+ systems, How to capture packet traces (tcpdump) on ONTAP 9.2 to 9.9 systems, How to download captured packet traces from ONTAP

 According to the NetApp Knowledge Base, packet traces are stored in the /etc/log/packet_traces directory of the node hosting the LIF. This applies to ONTAP 9.10 and above systems. For ONTAP 9.2 to 9.9 systems, the procedure to capture packet traces is similar, but the command syntax is slightly different. For ONTAP pre-9.2 systems, the procedure is different and requires the use of the tcpdump command. References = How to capture packet traces on ONTAP 9.10+ systems, How to capture packet traces (tcpdump) on ONTAP 9.2 to 9.9 systems, How to capture packet traces in ONTAP pre-9.2

 The wafl.dir.size.max event occurs when a directory has reached its maximum directory size (maxdirsize) limit, which prevents new file creation in that directory. The maxdirsize is a volume-level option that can be modified using the volume modify command. To solve this issue, you should increase the maximum directory size for the volume that contains the CIFS share, as long as it does not exceed 3% of the physical memory. Alternatively, you can reorganize the directory structure to avoid having too many files in one directory. References =

• Max Directory size error - NetApp Knowledge Base
• How to identify the target directory of wafl.dir.size.warning - NetApp Knowledge Base
• Post about wafl.dir.size.max | Source.kohlerville.com
• WAFL Max dirsize | uadmin

= The cause of the customer’s problem is that the port has an incorrect SFP inserted. According to the AutoSupport data, the node 1 has a device type of XL710 BQ, which is a 40GbE adapter that requires a QSFP+ transceiver1. However, the part number of the adapter is 111-02590, which is a 10GbE adapter that requires a SFP+ transceiver2. This mismatch prevents the link from coming up on node 1. The customer should replace the adapter with the correct one or use a compatible transceiver for the existing adapter. References = 1: NetApp Hardware Universe - X1144A 2: NetApp Hardware Universe - X1147A

• 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

References:

1: Are long Consistency Points (wafl.cp.toolong) normal? - NetApp Knowledge Base 2: How to troubleshoot SSD performance issues - NetApp Knowledge Base 3: How to troubleshoot SSD garbage collection issues - NetApp Knowledge Base 4: How to troubleshoot disk failures and replacements - NetApp Knowledge Base 5: ONTAP 9 - Hardware Universe - The Open Group

• SnapMirror is a data replication technology that allows efficient and flexible data protection and disaster recovery for NetApp ONTAP storage systems1
• SnapMirror transfers data between source and destination volumes using a network connection. SnapMirror can use storage efficiency features such as compression and deduplication to reduce the amount of data transferred and stored1
• SnapMirror transfers are scheduled and controlled by policies that define the frequency, retention, and priority of the transfers. SnapMirror policies can also specify the network bandwidth limit for the transfers2
• SnapMirror transfers are considered background tasks that run in the absence of user workload. SnapMirror transfers can consume CPU and disk resources on both source and destination systems, depending on the amount and type of data being replicated3
• SnapMirror transfers can throttle up or down depending on the availability of system resources and network bandwidth. SnapMirror transfers will throttle up when there is nouser workload, and throttle down when there is user workload. This is to ensure that SnapMirror transfers do not impact the performance of user operations3
• Therefore, if a customer is concerned with high CPU and disk utilization on their SnapMirror destination system, the best answer is to explain that background tasks such as SnapMirror throttle up in the absence of user workload. This is normal and expected behavior, and it does not indicate a problem with the system3

References:

1: ONTAP 9 Data Protection - SnapMirror - The Open Group 2: ONTAP 9 Data Protection - SnapMirror Policies - The Open Group 3: SnapMirror storage efficiency configurations and behavior - Resolution Guide - NetApp Knowledge Base

= The NetApp Cloud Volumes ONTAP Release Notes provide the most up-to-date and accurate information about the storage limits for different cloud platforms, licenses, and configurations. The release notes also include details about supported features, known issues, and limitations for each version of Cloud Volumes ONTAP. References = Storage limits - NetApp, Storage limits | NetApp Documentation, Storage limits in AWS | NetApp Documentation, Storage limits in Azure | NetApp Documentation

 The two throughput elements that are controlled by host applications are operation size and concurrency. Operation size refers to the amount of data that is transferred in a single I/O request, and concurrency refers to the number of I/O requests that are issued simultaneously. Both of these factors affect the throughput of a host application, as they determine how much data can be sent or received within a given time period. Larger operation sizes and higher concurrency can increase the throughput, but they may also increase the latency and resource consumption12. References: 1: NetApp Performance Analysis on Data ONTAP - Chapter 3: Host-Side Performance 2: NetApp Performance Analysis on Data ONTAP - Chapter 4: Storage System Performance