= 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

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. Reference = 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

If both root aggregates are destroyed in a two-node cluster, the cluster will be inoperable and the data will be inaccessible. To recover from this situation, you need to perform the following actions:
Install ONTAP from a USB device on one of the nodes. This will create a new root aggregate and a new cluster on that node.
Rejoin the second node to the re-created cluster. This will also create a new root aggregate on the second node and synchronize it with the first node.
Restore the cluster configuration and data from a backup, if available. Reference = ONTAP 9 Documentation Center Storage System Recovery Troubleshooting Recovering from a root aggregate failure

= The panic message indicates that the node encountered a fatal error while accessing the PCI card in slot 31. This could be due to a hardware failure, a firmware issue, or a driver problem. The first component to troubleshoot is the PCI card in slot 3, as it is the most likely source of the error. You can use the system node hardware pci show command to check the status of the PCI card and the system node hardware firmware update command to update the firmware if needed2. You can also use the Panic Message Analyzer tool from the NetApp Support Site to determine whether your panic was caused by a known software issue3. Reference = 1: REBOOT (panic) ALERT - AutoSupport message 2: [system node hardware pci show] 3: [Panic Message Analyzer tool]