Administration Guide › Setting Up Reservation Manager › Setup and Configuration › Make Virtual Machines Available to Users › Prerequisites for Supporting Reservations of Virtual Machines

Prerequisites for Supporting Reservations of Virtual Machines

Before Reservation Manager deploys virtual machines for use, identify platform resources for a resource pool as follows:

• Citrix XenServer: Datastores within a XenServer
• Huawei GalaX: Storage units within an Availability Zone (GalaX server)
• Red Hat Enterprise Virtualization (KVM): Hypervisors within a Cluster within a Datacenter (Red Hat Management server)
• VMware: One or more VMware ESX servers or clusters of VMware ESX servers

Next, define which resource pools on each server or cluster are targets for virtual machine creation. To determine whether a server or cluster can create a virtual machine, Reservation Manager calculates the amount of memory available for new virtual machines on the servers.

If the resource pools on the server or cluster have defined memory limits, Reservation Manager requires exclusive access to the targeted resource pool to determine resource availability for the future.

In the absence of memory limits at the resource pool level, Reservation Manager bases its calculations entirely on the amount of memory available to virtual machines at the server level. Reservation Manager requires exclusive use of the 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 the context of the data center and folder in which they are defined at the time they are added. If the data center or folder is renamed or the VM templates are moved to a different folder, the resource pools and templates that were previously added to Reservation Manager are no longer usable. Thus it is important to stabilize the platform structure before adding these items.