One of the new features of XenServer 7.1, as mentioned here previously, is PVS Accelerator. While Citrix already have Project Accelerator a free tool to assist with virtualisation project delivery - this is different. PVS Accelerator came from Project Diamond, part of Citrix's Better Together strategy, the PVS and XenServer teams developed a way to assist with simplifying and enhancing Citrix XenApp and XenDesktop deployments.
From the PVS documentation:
PVS-Accelerator enables a PVS proxy to reside in Dom0 (XenServer's Control Domain) on a XenServer host where streaming of a PVS vDisk is cached at the proxy before being forwarded to the VM. Using the cache, subsequent booting (or any IO requests) of the VM on the same host can be streamed from the proxy rather than streaming from the server over the network. Using this model, more local resources on the XenServer host are consumed, but streaming from the server over the network saves resources, effectively improving performance.
That's a lot of words for sure. I like Dan Feller's succinct sentence:
At a base level you'll need XenServer 7.1 (with the associated supplemental pack) and Provisioning Service 7.13 for this feature and this feature is only available in XenServer.
What is the impact on your services by deploying the PVS Accelerator? What should you watch out for - could something go wrong?