Reservation Pool Model
When an organization virtual datacenter is created in the Reservation Pool model, a non-expandable resource pool is instantiated with the reservation and limit values equivalent to the amount of resources allocated. This means if an organization virtual datacenter is created allocating 100GHz of CPU and 100GB of memory, a reservation pool is created for that organization virtual datacenter with a reservation and limit of 100GHz for CPU and a reservation and limit of 100GB for memory.
At the virtual machine level, when a virtual machine is deployed, it is instantiated with no reservation or limit for either CPU or memory.
Based on this use of reservations in the Reservation Pool model, VMware recommends the following:
Calculate the total available CPU and memory resources (less an amount reserved for global catalog templates), adjusted by the cluster redundancy ratio, at the provider virtual datacenter
level.
Determine how much resource, at the provider virtual datacenter
level, you want to make available for expanding organization virtual datacenter
s that are deployed to that provider virtual datacenter.
Establish a CPU and memory %RESERVED threshold at the provider virtual datacenter
level equivalent to the capacity of the underlying vSphere cluster, taking into account HA redundancy.
As the total amount of reserved CPU or reserved memory approaches the %RESERVED threshold, do not deploy new organization virtual datacenter
s in that provider virtual datacenter
without adding additional resources. If the corresponding vSphere cluster has reached its maximum point of expansion, a new provider virtual datacenter
should be deployed and any new organization virtual datacenter
s should be assigned to the new provider virtual datacenter
. In this way there is some predetermined amount of capacity available for expanding the existing organization virtual datacenter
s in the case where the provider virtual datacenter has reached its maximum point of expansion.
No over-commitment can be applied to the provider virtual datacenter
in the Reservation Pool model
due to the reservation being at the resource pool level.
Monitor the %RESERVED on a regular basis and adjust the value according to historical usage as well as project demand.