Ever since the introduction of XenDesktop 7, where the FMA took over and XenApp was integrated, a lot has been written with regards to its components, services, agents and so on. What surprises me though, is that the Server VDA is (almost) never mentioned, while this is, or at least was a brand new component. Never before was it optional to install a (relatively) lightweight agent onto a XenApp server, it was basically all or nothing.
12 services that make up the Citrix XenDesktop Flex Management Architecture!
The Flex Management Architecture is a service-orientated architecture, it consists out of ten, or twelve depending on your point of view, primary services in total. Let me explain, when administering a Virtual Desktop Infrastructure (VDI) for example, the Broker Service, a.k.a. the Desktop service, and the PortICA service both live on your desktop OS based VM’s, which are then part of the FMA as well, making it twelve services in total. Here I’ll provide you with a rundown of all services that make up the FMA including their responsibilities and some background information. I’ve included some artwork as well.
XenDesktop 7.x internals continued… The Server VDA in more detail.
Although the new FMA based Server VDA has been built from the ground up it still has a lot of similarities when compared to the ‘old’ ICA protocol stack deployed with XenApp 6.5 and earlier versions. However, unlike XenApp, the VDA (Virtual Delivery Agent) directly communicates with the Delivery Controller, it does this through the Broker Agent, basically the same way as we are used to with the desktop VDA (PortICA).
Troubleshooting Citrix XenDesktop & XenApp 7.x ? Read this !
When I was thinking about what to write next I thought it might be a good idea to use something ‘from the field’, an issue that I’ve been involved in personally during the past two weeks or so. Then I figured, why just discuss one specific use case when there is so much more to tell. So I won’t, instead I’ll focus on troubleshooting in general and use my ‘real world’ example as a reference throughout this article.