There are two types of vSphere reservation within vCAC. Reservations against a vSphere host and reservations against vSphere clusters. In order to create either a vCenter server is required. To make a reservation against a vSphere host it cannot be part of a vSphere cluster. Unlike physical reservations when creating a vSphere reservation you do not need to consume the entire vSphere host or Cluster in one reservation. You can create multiple reservations against a vSphere resoruce consuming parts of it in each reservation. You also have the ability to over subscribe the vSphere host or cluster.
When creating a vsphere reservation you have the ability to reserve memory, storage, and determine what networks are available within the reservation. vSphere reservation also give you the ability to determine how workloads can consume the resources. This is achieved in a number of ways. The first of which is a reservation priority. The reservation priority allows you some control over how you consume your resources. Let’s say you have two reservations assigned to a business group. If you wanted workloads to fully consume one before being placed against the other you would give the different priorities. The one you would want to fill first would be say a priority of 1,and the other would be a priority of 2. If you want to fill them equally you would give them the same priority. This will cause vCAC to round robin the placement of the workloads.
You can also implement the same types of placement priority for datastores within the reservation using the priorities you associate to each datastore.
Continue reading “vCloud Automation Center – vCAC 6.0 Creating a vSphere Reservation”
