Novell PRODUCT NAME 10.3 - DEPLOYING ZENWORKS ON CITRIX SERVER BEST PRACTICES GUIDE... User manual

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AUTHORIZED DOCUMENTATION
Deploying ZENworks on a Citrix Server Best Practices Guide
Product Name
10.3
December 13, 2010
Deploying ZENworks on a Citrix Server Best Practices Guide

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Contents 5
Contents
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About This Guide 7
1 Best Practices for Deploying ZENworks on a Citrix Server 9
1.1 Understanding the Need for Integrating ZENworks and the Citrix Server . . . . . . . . . . . . . . . . . 9
1.2 Gathering Critical Information for Design Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.2.1 Performing a Technical Assessment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.2.2 Factors Influencing Scalability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.2.3 Scale Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
1.2.4 Ports Used by the ZENworks Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.3 Performing Lab Tests and Validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.4 Deploying the ZENworks Configuration Management Agent on Citrix Server . . . . . . . . . . . . . 12
1.5 ZENworks Configuration Management Agent Architecture . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
1.6 ZENworks Configuration Management Tuning Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.6.1 User Sessions on a Citrix Server Fail to Terminate . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.6.2 High Utilization of Resources on a Citrix Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.6.3 High Consumption of Memory on a Citrix Server . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.6.4 Disabling Random Refresh Might Cause the ZENWorks Adaptive Agent to
Crash on a Citrix Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
1.6.5 Logging in to the User Source on a ZENworks Server is Slow . . . . . . . . . . . . . . . . . 14

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About This Guide 7
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About This Guide
The purpose of this Best Practices Guide is to describes the items you need to consider when
deploying Novell ZENworks 10 Configuration Management on a Citrix server.
Audience
This guide is intended for ZENworks administrators.
Feedback
We want to hear your comments and suggestions about this manual and the other documentation
included with this product. Please use the User Comments feature at the bottom of each page of the
online documentation, or go to the Novell Documentation Feedback site (http://www.novell.com/
documentation/feedback.html) and enter your comments there.
Additional Documentation
ZENworks Configuration Management is supported by other documentation (in both PDF and
HTML formats) that you can use to learn about and implement the product. For additional
documentation, see the ZENworks 10 Configuration Management SP3 (10.3) documentation (http://
www.novell.com/documentation/zcm10/).

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Best Practices for Deploying ZENworks on a Citrix Server
1
9
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1
Best Practices for Deploying
ZENworks on a Citrix Server
This section describes the items you need to consider when deploying Novell ZENworks 10
Configuration Management on a Citrix server. This information is intended to supplement the online
resources that Novell provides to give you a better understanding of the design-related topics and
requirements when deploying a Novell ZENworks 10 Configuration Management solution on a
Citrix server.
ZENworks Configuration Management is also supported by other documentation (in both PDF and
HTML formats) that you can use to learn about and implement the product. For additional
documentation, see the ZENworks 10 Configuration Management SP3 (10.3) documentation (http://
www.novell.com/documentation/zcm10/index.html).
The information in this document is organized as follows:
Section 1.1, “Understanding the Need for Integrating ZENworks and the Citrix Server,” on
page 9
Section 1.2, “Gathering Critical Information for Design Activities,” on page 10
Section 1.3, “Performing Lab Tests and Validation,” on page 12
Section 1.4, “Deploying the ZENworks Configuration Management Agent on Citrix Server,”
on page 12
Section 1.5, “ZENworks Configuration Management Agent Architecture,” on page 12
Section 1.6, “ZENworks Configuration Management Tuning Parameters,” on page 13
1.1 Understanding the Need for Integrating
ZENworks and the Citrix Server
When ZENworks and the Citrix Server are properly integrated, these powerful solutions provide a
functionally rich and manageable solution that is not possible when they are implemented in
isolation. It is important to provide additional functionality without losing the functionality or
reliability of either of the components.
By integrating Novell ZENworks Configuration Management and the Citrix Server, you achieve the
following benefits:
Improved application accessibility and manageability
Strengthened security through Patch Management
Improved compliance through Asset Management
Improved remote access of applications that are on the Citrix server
Allows you to gain simple and one-click access to the applications on the Citrix server. Having
all your local and remote software in one place allows you to reduce complexity and increase
productivity.
Management of the Citrix servers

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Patching of the Citrix servers and the applications hosted on the Citrix servers
Load balancing of the Citrix servers
Availability of support for the Citrix Server farm that has servers that are a part of an Active
Directory forest or a workgroup
1.2 Gathering Critical Information for Design
Activities
You need to gather information to help you design your specific implementation for deploying
Novell ZENworks 10 Configuration Management on a Citrix Server.
Review the following sections:
Section 1.2.1, “Performing a Technical Assessment,” on page 10
Section 1.2.2, “Factors Influencing Scalability,” on page 11
Section 1.2.3, “Scale Numbers,” on page 11
Section 1.2.4, “Ports Used by the ZENworks Agent,” on page 12
1.2.1 Performing a Technical Assessment
You need to perform a technical assessment to review what you already have, identify what you
need, and document your requirements.
You also need to have a good understanding of the existing infrastructure. To do this, you should
hold a set of workshops or meetings to obtain all the information you need.
The two main results from a technical assessment are documentation on your findings, along with a
set of tasks that you need to perform. Information that you should gather includes the following:
Which version of Citrix Server should you use?
For more information on the supported versions of Citrix Server, see the ZENworks 10
Configuration Management Installation Guide (http://www.novell.com/documentation/zcm10/
index.html).
What is the maximum number of user sessions per server that can be active on Citrix Server?
If the maximum number of user sessions per server is more than the recommended number, try
adding more servers to the Citrix farm. We plan to provide such recommendations for the
ZENworks 11 Configuration Management product after the product is released.
Is user-based management used?
If it is used, a policy or bundle must be assigned to the users only if the policy or bundle is not
applicable to all the users logging in to the server. However, if the policy or bundle is applicable
to all the users logging in to the server, assign it to the device instead of assigning it to all the
users.
For example, if there are 150 bundles that are assigned to the users and 50 bundles are common
to all the users logging in to a device, assign these 50 bundles to the device instead of the user.
Are servers available in the Citrix farm? If they are, how many servers are available and are
these servers load balanced?

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Make sure that no single server is overloaded. For information on load balancing mechanisms,
see the Citrix Web site (http://www.citrix.com).
Is the Novell Client installed on the Citrix server?
If the Novell Client is not installed on a Citrix server, the Citrix server session might crash
during login. To avoid this issue, see “Tasks to be Performed After Deploying the Agent on
Citrix Servers” on page 12.
Do you plan to use the DLU policy? If you do, are the profiles volatile?
If there is more than one Citrix server in a farm, you must use the volatile DLU and Roaming
Profile policies to enable the users and their profiles to exist on all the servers in the farm. If
you do not use the volatile DLU and Roaming Profile policies, a profile synchronization issue
might exist among the servers.
Do you have a mechanism to handle idle and disconnected sessions? If you do, how often is it
used?
The idle and disconnected sessions should be periodically logged out to enable the ZENWorks
events such as memory release and policy unenforcement to happen. Otherwise, the server
might have high memory consumption.
Are the Citrix servers used only to distribute applications or they are also used as terminal
servers?
You must deploy ZENworks 10 Configuration Management on Citrix Server only if you want
the Citrix server to be used as a terminal server in addition to distributing applications.
However, if you only intend to distribute applications, create thin client bundles and assign
them to devices or users
1.2.2 Factors Influencing Scalability
The main physical factor that govern the scalability of the Citrix servers is the RAM. The majority
of operations are performed by three services: zenworksWindowsService, ZenNotifyIcon, and
zenUserDaemon. The RAM consumption depends on the number of sessions and the number of
effective assignments that each session has.
For the minimum hardware recommendations, refer to the Citrix Web site (http://www.citrix.com).
If you can provide hardware that exceeds these recommendations, your system will perform better.
Additional processing power and faster drives can make the systems more responsive.
The other factors that you need to consider include:
Device refresh frequency
Bundle schedules
System requirements
1.2.3 Scale Numbers
The information will be available for ZENworks 11 Configuration Management product after the
product is released.

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1.2.4 Ports Used by the ZENworks Agent
For information on the ports used by the ZENworks Agent, see the ZENworks 10 Configuration
Management Installation Guide (http://www.novell.com/documentation/zcm10/index.html)
1.3 Performing Lab Tests and Validation
Before deploying ZENworks 10 Configuration Management on Citrix Server in a production
environment, we recommend that you test ZENworks 10 Configuration Management on the Citrix
servers with the exact load that needs to be in the production environment.
1.4 Deploying the ZENworks Configuration
Management Agent on Citrix Server
For deploying the ZENworks Configuration Management Agent on Citrix Server, see the Deploying
the ZENworks Adaptive Agent section in the ZENworks 10 Configuration Management Discovery,
Deployment, and Retirement Reference (http://www.novell.com/documentation/zcm10/index.html).
Tasks to be Performed After Deploying the Agent on Citrix Servers
After deploying the ZENworks Adaptive Agent on Citrix servers, do either of the following on the
Citrix servers before launching a terminal session with the server:
Rename NWGina.dll.
1. In the
c:\windows\system32 directory, rename NWGina.dll .
2. In the Registry Editor, go to
HKLM\Software\Microsoft\WindowsNT\CurrentVersion\Winlogon , and change the
value of the
CtxGinaDLL key to the new name of NWGina.dll .
3. Reboot the server.
Install the Novell Client.
IMPORTANT: If you fail to perform the preceding tasks, you will encounter ICA login session
issues when you try to launch a terminal session with the Citrix server. For more information about
the ICA login session issues, see “Unable to launch a terminal session with a Citrix Server that has
ZENworks Adaptive Agent installed” in the ZENworks 10 Configuration Management System
Administration Reference (http://www.novell.com/documentation/zcm10/index.html).
1.5 ZENworks Configuration Management Agent
Architecture
For information on the ZENworks Configuration Management architecture, see The ZENworks
Configuration Management Architecture in the System Deployment and Best Practices Guide (http:/
/www.novell.com/documentation/zcm10/index.html).

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1.6 ZENworks Configuration Management
Tuning Parameters
This section provides information about the scenarios you might encounter if the parameters
configured for a Citrix server are not appropriately tuned as per the deployment environment:
Section 1.6.1, “User Sessions on a Citrix Server Fail to Terminate,” on page 13
Section 1.6.2, “High Utilization of Resources on a Citrix Server,” on page 13
Section 1.6.3, “High Consumption of Memory on a Citrix Server,” on page 14
Section 1.6.4, “Disabling Random Refresh Might Cause the ZENWorks Adaptive Agent to
Crash on a Citrix Server,” on page 14
Section 1.6.5, “Logging in to the User Source on a ZENworks Server is Slow,” on page 14
1.6.1 User Sessions on a Citrix Server Fail to Terminate
Terminating a thin client application that is running on a Citrix server might not close the user
session on the server. Consequently, when the user logs out of the server, the roaming profile data
for the user session is not saved.
To close the user session on the Citrix server, perform the following steps on the server:
1Open the Registry Editor.
2Go to
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Citrix\wfshell\TWI .
3Change the value of LogoffCheckSysModules from
ZCMUMHelper.exe to
ZenUserDaemon.exe .
4Reboot the device.
NOTE: This issue has been fixed in Update for ZENworks 10 Configuration Management SP3
(10.3.1) release.
1.6.2 High Utilization of Resources on a Citrix Server
During a partial or general refresh of the ZENworks Adaptive Agent on a terminal session of a
Citrix server, the agent simultaneously refreshes the sessions of all the users logged into the terminal
server. If too many users have logged into the terminal server, this might cause high usage of system
resources, and subsequently the ZENworks Adaptive Agent might take considerable time to refresh
the terminal server.
To avoid high utilization of resources on the Citrix server:
1Open the Registry Editor.
2Go to
HKLM\Software\Novell\ZCM\ .
3Create a string called EnableBatchRefresh and set its value to 1. By default, the number of user
sessions that can be simultaneously refreshed is 5.
4(Optional) If you want to change the default number of user sessions that must be
simultaneously refreshed, create a string called maxUserRefreshThreads and set the desired
value.

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1.6.3 High Consumption of Memory on a Citrix Server
On a Citrix server or a terminal server, if a user disconnects a session without logging out from it,
the session exists in the disconnected state. This might cause high memory consumption of the agent
service.
To avoid high consumption of memory on the Citrix server, do one of the following:
Ensure that the users log out from a session instead of just disconnecting the session.
Set a time limit to automatically log out from a disconnected session. For detailed information,
see the Microsoft Knowledgebase (http://support.microsoft.com/kb/186566).
1.6.4 Disabling Random Refresh Might Cause the ZENWorks
Adaptive Agent to Crash on a Citrix Server
If Random Refresh for the ZENWorks Adaptive Agent is disabled and if multiple users log in to the
Citrix server at the same time, then all the sessions try to refresh at the same time. This can cause
resource contention, and subsequently causes the agent to crash because the cache access is not
synchronized. To avoid this, Random Refresh must be enabled for the ZENWorks Adaptive Agent.
1.6.5 Logging in to the User Source on a ZENworks Server is
Slow
Logging in to the user source on a ZENworks Server from the managed device might take some time
because the login process executes the device refresh synchronously.
To speed up the login process, perform the following steps to execute the device refresh
asynchronously:
1Open the Registry Editor.
2Go to HKEY_LOCAL_MACHINE\Software\Novell\ZENworks.
3Create a string called ZENLoginUserRefreshAsync and set its value to TRUE.
4Log in to the device again.
IMPORTANT: If you change the login process to execute the device refresh asynchronously, the
latest policies might not be immediately available. With this change, you make the login
performance more important than the accuracy of the policies.