5V0-35.21 Exam Results

Removing the corrupted node, and then disabling and re-enabling vRealize Operations Manager High Availability to reassign the primary replica role to another existing node in the cluster is the correct way to resolve the availability issue within vRealize Operations Manager. This method ensures that the cluster can continue to operate with high availability and continuous availability, as the primary replica node is responsible for providing critical services that cannot be replicated across all cluster nodes, such as Global xDB, NTP server, and GemFire locator. By removing the corrupted node, the administrator can prevent any further issues or conflicts with the cluster configuration. By disabling and re-enabling vRealize Operations Manager High Availability, the administrator can trigger the cluster to select a new primary replica node from the existing data nodes, and synchronize the data and services with the primary node. Deploying a new vRealize Operations Manager node, and then adding it to the existing cluster is not a valid option, as it does not address the primary replica role assignment, and may cause additional problems with the cluster configuration. Cloning an existing primary vRealize Operations Manager node, and then adding it into the vRealize Operations Manager cluster is not a feasible option, as it may result in duplicate node IDs, IP addresses, and hostnames, and may cause conflicts with the cluster configuration. Asking the backup administrator to restore the corrupted primary replica node, and then refreshing the nodes from thevRealize Operations Manager administrator interface is not a reliable option, as it may take a long time to restore the node, and may not guarantee the consistency and integrity of the data and services on the node. References: Remove a Node from a Cluster, section “Remove a Node from a Cluster”. About vRealize Operations Cluster Nodes, section “About vRealize Operations Cluster Nodes”. vRealize Operations Manager User Guide, section “Create and Configure Dashboards”.

 The reason why vRealize Operations reports that the cluster has 0 days remaining when the actual CPU overcommit ratio is less than the 4:1 configured value is that the CPU demand in the cluster is greater than the total CPU capacity. The allocation model is a method of calculating the capacity and utilization of resources based on the amount of resources that are allocated to the objects, such as virtual machines, clusters, or datastores. The allocation model allows the administrator to set the overcommit ratio for CPU, memory, or disk space, which is the ratio of the allocated resources to the available resources. The overcommit ratio determines how much the resources can be overcommitted without affecting the performance or availability of the objects1.

When the administrator enables the allocation model in a policy and sets the CPU overcommit ratio to 4:1 for all vSphere clusters in a vSphere datacenter, it means that the administrator allows the CPU resources to be allocated four times more than the availableCPU resources in the clusters. For example, if a cluster has 100 GHz of CPU capacity, the administrator can allocate up to 400 GHz of CPU resources to the virtual machines in the cluster. However, this does not mean that the virtual machines can consume up to 400 GHz of CPU resources without any impact. The actual CPU consumption of the virtual machines depends on the CPU demand, which is the amount of CPU resources that the virtual machines require to run their workloads. The CPU demand can vary depending on the workload type, intensity, and pattern2.

If the CPU demand in the cluster is greater than the total CPU capacity, it means that the virtual machines are requesting more CPU resources than the cluster can provide. This can result in CPU contention, performance degradation, and SLA violations. In this case, vRealize Operations reports that the cluster has 0 days remaining, which means that the cluster has reached its maximum capacity and cannot accommodate any more CPU demand. The cluster has 0 days remaining even if the actual CPU overcommit ratio is less than the 4:1 configured value, because the overcommit ratio only reflects the allocated resources, not the consumed resources. The overcommit ratio does not guarantee that the cluster can support the CPU demand of the virtual machines, but only indicates the potential capacity of the cluster based on the allocation model1.

References: 1: Allocation Model - VMware Docs 2: Demand Model - VMware Docs