Virtualization - Cloud

Month: December 2016

Delivery Controller vs Data Collector


Delivery Controller

Data Collector

No LHC LHC(Local Host Cache)
Connection Leasing No Connection Leasing
Pulls all information, static as well as dynamic from the central Site database Has static as well dynamic(run-time) information cached locally
There is no direct communication between delivery controllers.
No scheduled communication between the VDA’s and/or Site databases, only when needed.
Communicates with the IMA store, Peer  Data Collectors and its session Hosts(within its own zone) on a scheduled interval, or when a Farm configuration change has been made.
Is responsible for brokering and maintaining new and existing user session only. Often hosts user session, but can be configured as a dedicated data collector as well.
Can have a different operating system installed then the server and desktop VDA’s Need to have the same operating system as all other session hosts and DC’s within same Farm.
Core services installed only. The HDX stack is part of VDA software Has all the XenApp 6.5 or earlier bits and bytes fully installed.
Zones are optional. When configured they do need at least one Delivery controller present. Each Zone has one Data Collector. Having multiple data collector means multiple zones.
Election does not apply.
Deploy multiple, at least 2 Delivery controllers per site /zone (again one per zone is the minimum)
Can, and sometimes need to be elected. Configure at least one other Session Host per zone that can be elected as a Data Collector when needed.
When Central Site DB is down, no site wide configuration changes are possible. By default, Connection Leasing will kick in, enabling users to launch sessions which are assigned at least once during last 2 weeks prior to DB going offline. when IMA Db is down, no Farm wide configuration changes are possible. Everything else continues to work as expected due to the LHC present on the Data Collectors and Session Hosts in each Zone.
A Delivery controller can have a direct connection(API) with a Hypervisor or cloud platform of choice. Does not have any direct connection(API) with a Hypervisor or cloud platform management capabilities.
Almost all the communication directly flows through a Delivery Controller to Central Site DB. Session Hosts as well as Data Collectors directly communicate with IMA database.
VDA’s needs to successfully register themselves with a Delivery controller. When a XenApp server boots it needs a IMA service but it will not register itself anywhere.


Citrix IMA vs. FMA…

IMA back then…

FMA as it is today…

IMA – Independent Management Architecture. FMA – Flexcast Management Architecture
Farm. Site
Worker Group. Machine Catalog / Delivery Group.
Worker / Session Host / XenApp server. Virtual Delivery Agent (VDA). There is a
desktop OS VDA as well as a server OS
VDA, including Linux.
Data Collector (one per zone). Delivery Controller (multiple per Site).
Zones. Zones (as of version7.7)
Local Host Cache (LHC). Conenction Leasing
Delivery Services Console / App center. Citrix Studio (including StoreFront) and
EdgeSight monitoring (optional). Partly built into Director
Application folders. Application folders (new feature in 7.6) and
Tags (all 7.x versions).
IMA Data store. Central Site database (SQL only).
Load evaluators. Load management policies.
IMA protocol and service. Virtual Delivery Agents / TCP.
Farm Administrators. Delegated Site Administration using roles
and scopes, which are configurable as well.
Citrix Receiver. Citrix X1 Receiver. It will provide one
interface for both XenApp / XenDesktop as
well as XenMobile.
Smart Auditor. Session Recording.
Shadowing users. Microsoft Remote Assistance, launched
from Director.
USB 2.0. USB 3.0. Support
Session Pre-launch and Session Lingering. Session Pre-launch and Session Lingering.
Both have been re-introduced.
Power and capacity management. Basic power management from the GUI- advanced via powershell
Webinterface / StoreFront. Webinterface / StoreFront.
Single Sign-on for all or most of applications There is no separate Single Sign-On
component available for XenApp 7.x. This is
now configured using a combination of StoreFront, Receiver and policies.
Installed hotfixes inventory Installed hotfixes inventory from studio
Support for Windows Server 2003 and
FMA 7.x supports Windows Server 2008
R2 ,Server 2012 R2,2016


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