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Before Reservation Manager deploys virtual machines for use, identify one or more VMware ESX servers or clusters of VMware ESX servers for use. Next, define which resource pools on each ESX server or cluster are targets for virtual machine creation. To determine whether an ESX server or cluster can create a virtual machine, Reservation Manager calculates the amount of memory available for new virtual machines on the ESX servers.
If the resource pools on the ESX server or cluster have memory limits defined, the Reservation Manager requires exclusive access to the resource pool that is targeted to determine resource availability for the future.
In the absence of memory limits at the resource pool level, the Reservation Manager bases its calculations entirely on the amount of memory available to virtual machines at the ESX server level. The Reservation Manager requires exclusive use of the ESX Servers used for virtual machine creation to determine resource availability accurately in the future.
Note: The addition of resource pools and VM templates is performed in context to the vSphere Datacenter and the folder in which they are defined at the time they are added. If the VMware datacenter or folder is renamed or the VM templates are moved to a different folder, the resource pools and templates that were previously added to the Reservation Manager will no longer be usable. Thus, it is important to stabilize the vSphere structure before adding these items.
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