An administrator may wish to use vSphere Resource Pools as a means of organizing and segregating VMs, including VRAs. While placing a VRA into a resource pool is supported, it is important to understand the ramifications of doing so.
When placing a VRA into a resource pool, it is important to be aware of the RAM and CPU restrictions that might be placed on the VRA. The ramifications for each resource are explained below.
- On an ESXi 4.x host, VRA RAM is not reserved. While there will be no issue placing the VRA into the resource pool, if it does not have access to the necessary RAM resources, there may be some serious performance issues.
- On an ESXi 5.x host, VRA RAM is reserved. If a resource pool cannot accommodate the VRA RAM reservation (2GB by default), the VRA VM cannot be placed inside the pool.
- If a VRA's CPU resources are restricted, performance degradation will result. This will result in an increased frequency of Bitmap Syncs, as well as a higher RPO.