VMware vsphere Resource Cluster

VMware vsphere provides virtual machines with a virtualized infrastructure that divides physical resources into resources and provides virtual resources, including CPU and memory, for each virtual machine. To allocate these resources well, you must use a resource pool. Resource pools are logical abstractions that manage resources flexibly. Resource pools can be grouped into hierarchies that are used to partition the available CPU and memory resources hierarchically.

One, resource pool

Resource pooling enables you to delegate control of a host (or cluster) resource, which has a distinct advantage when you use a resource pool to divide all resources within a cluster. You can create multiple resource pools as a direct subset of hosts or clusters and configure them. You can then delegate control of the resource pool to other individuals. Resource pools have a flexible hierarchy organization that can add, remove, or reorganize resource pools as needed, or change resource allocations. Resource pools are isolated from each other and shared within the resource pool, and administrators can provide a resource pool to departmental administrators. Changes in resource allocations within a department's resource pool do not have an unfair impact on other unrelated resource pools. Resource pools can set up access control and delegation, where the administrator is the first resource pool available to departmental administrators who can set up all virtual machine creation and management operations within the resources granted to the resource pool under current share, reservation, and throttling conditions. Delegates are typically executed together with permission settings. Resource pooling separates resources from hardware, and if you are using a DRS-enabled cluster (described later in this section), resources for all hosts are always assigned to the cluster. This means that administrators can manage resources independently of the actual hosts that provide the resources. If you replace three 2GB hosts with two 3GB hosts, you do not need to make changes to the resource allocation. Resource pools can manage groups of virtual machines that run multi-tiered services, grouping virtual machines into multi-tiered services in a resource pool. Instead of having to set resource settings for each virtual machine, users can control the aggregation of resource allocations to the virtual machine collection by changing the settings on the owning resource pool.

The user can create a child resource pool for the root resource pool, or you can create a child resource pool with any child resource pools created by the user. Each child resource pool has a portion of the parent resource, but the child resource pool can also have its own child resource pool hierarchy, each of which represents a smaller percentage of the compute capacity.

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Suppose an ESXi host has more than one virtual machine. A requires the use of three virtual machines, and B requires two virtual machines. Because B requires more CPU and memory, the administrator creates a pool of resources for each group. The administrator sets the CPU share of the B resource pool and the A resource pool to high and normal so that B can allow automatic testing. A second resource pool with less CPU and memory resources is sufficient to meet the lower load requirements of a, as long as B does not fully utilize the resources allocated to it, a can use these available resources,

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VMware vsphere Resource cluster