NetApp NS0-593 Exam Dumps

A Twinax cable is a type of copper cable that is used to connect cluster ports to cluster switches1.

A cluster port is a network port that is configured for cluster communication and data access2.

A cluster switch is a network switch that is used to interconnect the nodes in a cluster and provide redundancy and load balancing3.

A cluster network is a network that enables cluster communication and data access between the nodes in a cluster and external clients4.

A cluster network can be degraded due to various reasons, such as misconfiguration, malfunction, or excessive link errors on the cluster ports or the cluster switches.

Link errors are errors that occur on the physical layer of the network, such as CRC errors, length errors, alignment errors, or dropped packets.

Link errors can indicate a problem with the cable, the switch port, the network interface card (NIC), or the cable connector.

In this scenario, the alert messages state that the cluster network has degraded and the errors are being generated from Node 2, interface e0b.

The first step to solve this problem is to replace the Twinax cable between Node 2, interface e0b and the NetApp CN1610 switch, as this could be the source of the link errors.

Replacing the cable could resolve the issue and restore the cluster network to a healthy state.

If replacing the cable does not solve the problem, then other steps may be required, such as checking the switch port, the NIC, or the cable connector, or replacing the switch or the motherboard.Reference:

1: Cluster network cabling, ONTAP 9 Documentation Center

2: Cluster ports, ONTAP 9 Documentation Center

3: Cluster switches, ONTAP 9 Documentation Center

4: Cluster network, ONTAP 9 Documentation Center

[5]: How to troubleshoot CLUSTER NETWORK DEGRADED error messages, NetApp Knowledge Base

[6]: Cluster network degraded due to high CRC errors on cluster ports, NetApp Knowledge Base

The ONTAP command that will help isolate a possible MTU mismatch isnetwork ping -lif jumbo_01 -vserver svm1_cluster1 -destination 192.168.0.210 -disallow-fragmentation true -packet-size 5000. This command will send a ping packet of 5000 bytes from the logical interface (LIF) jumbo_01 to the destination IP address 192.168.0.210, without allowing fragmentation. If the ping fails, it means that there is an MTU mismatch somewhere along the path.If the ping succeeds, it means that the MTU is consistent and the problem is elsewhere12.Reference:1: Check the MTU network setting on the storage system | NetApp Documentation2: How to adjust the MTU for an ONTAP interface - NetApp Knowledge Base

= 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

= The NetApp sanlun command is a tool that returns information about the LUNs mapped to your host, multipathing, and information necessary to create initiator groups. It is part of the Linux Unified Host Utilities package, which also includes other tools to manage NetApp storage, such as failover policies and physical paths. To run the sanlun command, you must install the Host Utilities package on your Linux host. The other options are not relevant for this scenario, as they are either not required or not compatible with the Linux host.Reference=Install Linux Unified Host Utilities 7.1,SAN Toolkit

IQN stands for iSCSI Qualified Name, which is a unique identifier for an iSCSI initiator or target1.

ONTAP uses IQN to authenticate and authorize iSCSI sessions2.

If two hosts have the same IQN, they will cause a conflict and ONTAP will reject the new session request from the second host3.

This will result in the host losing the connection to the iSCSI target and then reporting that the session was reestablished, as shown in the exhibit.

To avoid this problem, each host should have a unique IQN.Reference:

iSCSI Qualified Name (IQN) - NetApp

iSCSI authentication and authorization - NetApp

Troubleshooting iSCSI issues - NetApp

[Configuring iSCSI initiators - NetApp]