NCS-Core Exam Dumps - Nutanix Certified Services Core Infrastructure Professional (NCS-Core 6.8)

https://hyperhci.com/2020/07/29/nutanix-cluster-services-down-troubleshooting/

Ref: https://portal.nutanix.com/page/documents/details?targetId=Prism-Central-Guide-Prism-v55:mul-security-ssl-certifi cate-pc-t.html

Ref: https://portal.nutanix.com/page/documents/details?targetId=System-Specs-G6-Single-Node:set-block-connect-c.html

In scenarios where a software-only installation is planned on Dell servers without pre-configured IP addresses for out-of-band management interfaces, the iDRAC MAC addresses are crucial. Using iDRAC (Integrated Dell Remote Access Controller), a consultant can perform a bare metal installation remotely and manage the servers effectively. This method is preferable when IP addresses are not initially available, allowing the consultant to utilize the out-of-band management network for setup. References: Nutanix Installation and Configuration guides, especially those pertaining to Dell hardware, available through the Nutanix Bible and official Nutanix training materials.

The issue indicated is that the VMs, specifically the CVMs (Controller VMs), do not restart on the remaining nodes after a network cable is removed, demonstrating a failure of HA (High Availability). The setting that should be verified is "Host Monitoring" within the ESXi HA/DRS settings. This setting enables the host to monitor the state of other hosts in the cluster and take necessary actions like VM restarts on other hosts in the event of failures. If it's disabled, the cluster wouldn't automatically manage the failover of VMs upon host disconnection. References: Nutanix Bible (https://www.nutanixbible.com/ ), Nutanix Official YouTube Training Series

Ref:

rx_crc_errors are caused either by faults in layer 1 (in the past, we have seen failed twinax cables and incorrect types of fibre being used), or issues with jumbo frames on the network. In an environment with 10 Gig switches that use cut-through forwarding (Cisco Nexus, Arista, Cisco devices using IOS default to Store and Forward switching), any packets that come into the switch will get forwarded out the destination interface once the switch has read the destination MAC address. If that packet has an MTU over what is configured on the interface, it will cut off the packet at the designated MTU, causing the server to receive a malformed packet, which will throw a CRC error.

If you have a layer 1 issue, you will see rx_crc_errors, not on all but one or two nodes.

Ref: https://portal.nutanix.com/page/documents/solutions/details?targetId=BP-2005_Data_Protection:BP-2005_Data_Protection

After an onsite cluster deployment, the As-Built Guide is a crucial document that provides detailed information about the final configuration of the system. However, certain data in the As-Built Guide might require adjustment or might be missing completely.

In this case, the Nutanix Node Port Layout (Option A) and the Physical Rack Layout (Option C) are two data that might require adjustment or might be missing completely. The Nutanix Node Port Layout provides a visual representation of the network connections for each node in the cluster, while the Physical Rack Layout provides a visual representation of the physical arrangement of the nodes in the rack. Both of these data are crucial for understanding the physical and network configuration of the cluster, and any inaccuracies or omissions in these data could lead to confusion or issues in the future.

Therefore, the consultant should ensure that the Nutanix Node Port Layout and the Physical Rack Layout in the As-Built Guide are accurate and complete.

References:

• [Nutanix Support & Insights]
• [Nutanix Community]
• [Nutanix Documentation]
• [Nutanix Certified services - core (NCS-Core) 6.8 - Nutanix University]
• [Nutanix Bible]
• [Nutanix Certified services - core (NCS-Core) 6.8 Playlist - YouTube]