Data collectors relay information to all other data collectors in the farm Data collectors receive incremental data updates and queries from servers within their zone.
Data collector exists as an in-memory database that maintains dynamic informationabout the servers in the zone, such as server loads, session status, published applications, users connected, and license usage.By default, in a XenDesktop farm, the initial Desktop Delivery Controller (DDC) installed is the farm master acts as the Data Collector, performing desktop resolution operations during starting the desktop and managing the hosting infrastructure.Data Collector is the component of IMA used in XenDesktop up to v4.If specific service on Delivery Controller is unavailable then its respective resources will become in accessible for users.If just one of the Delivery Controller is unavailable, then VDA’s instantly (15-90 seconds) auto load-balances to other available Delivery Controllers in the Site.However, the sessions that are already connected will continue to work. Thus users cannot access their applications or desktops. If none of the Delivery Controller Servers are available in a Site, VDA’s fails to registerthemselves with Delivery Controllers and thus will be unavailable for new session launches.What is the impact to end users if Delivery Controller (FMA) is unavailable? It includes the functionality of Data Collector and Desktop Delivery Controller (DDC) roles that existed in previous XenDesktop versions up-to v4 that uses IMA.Ģ.the power management (shutting down of virtual desktops when needed), and so on.
Delivery Controller is the Core component of XenDesktop v5 & above, using FMA.