VanBragt.Net Virtualization

Accessing the old environment from XenApp/XenDesktop 7.x

Details: Published: 21 January 2015

In almost every current XenDesktop/XenApp project for a specific period some applications are not available on the new platform, which are required by a group of users. A decision could be to let those workers do their work on the current/old platform. However most organizations don’t want that because the users don’t have access to new technologies of versions of other applications. In most cased the customer is looking for a way to offer access to those applications within the new platform. In this article I described the possible access methods to those applications running on a legacy environment, followed by the technical options to provide the access (including the advantages and disadvantages).

XenApp 6.x Maintenance Shutdown and Start-up Scripts

Details: Published: 07 January 2015

At one of my customers we build a XenApp 6.5 environment, where the XenApp Session Hosts were running on local storage of the Hypervisor (VMware ESX 5.5). At this customer the hypervisor and Citrix XenApp were maintained by separate teams. The hypervisor team was used to use shared storage and the vMotion capabilities of ESX for their maintenance tasks on the ESX host during daily operations. However now the virtual machines were running local storage this technique could not be used anymore and the hypervisor team found it difficult to fulfill their maintenance tasks.

After some discussion we agreed that the process should be as easy as possible (without less inference of the XenApp team) and that it should be possible to do the maintenance during daily operations. The first step was adding additional capacity, so maintenance during the business hours was possible. Secondly I wrote a set of small simple scripts that the maintenance can be done without less interaction between the teams and user impact is minimal. In this article I would like to share those scripts with you including explaining what they are doing.

Reboot Script for XenApp/XenDesktop 7.x (for 24x7 environments)

Details: Published: 17 December 2014

Updated on 22 December 2015 with some small adjustments (removing old files and wait timeout to check if the server is online again)

Some years ago I already published a reboot script for XenApp 6.5. Also Citrix did a good job to make the reboot possibilities within the Citrix policies more flexible and robust. The only real disadvantage is the possibility to disable the logon possibilities 60 minutes before the real actual reboot take place. However this can be overwritten using a specific registry key, which is not well known or documented (HKLM\Software\Policies\Citrix\IMA\Restart Options\Disable Logons\RebootDisableLogonMinutes. When migrating from XenApp 6.5 to XenApp/ XenDesktop 7.x you will probably be a bit disappointed. In this article I will starting describe the reboot possibilities in XenApp/XenDesktop 7.x out of the box, followed by explaining a script that I have written to satisfy more requirements.

PVS Resource Usage Part 1

Details: Published: 26 November 2014

Some people are saying that PVS is complex. I personally don’t think that PVS is complex looking from an infrastructure endpoint, but it can be complex to understand the concept of PVS and the new way of working. When people get that part, the complexity is not a bottleneck anymore. But when people understand the way of working understand new questions are often raised. How many bandwidth does this solution requires, which hardware resources requires these PVS server to serve their role. In this article series I’m diving into this topic. First I will discuss the theory of the resource usage by Citrix, followed by real life figures. The real life figures are divided in two parts: daily usage and boot (storm) usage. As just mentioned we are starting with the theory.

XenApp 6.5 (Troubleshooting) Tips and Tricks Part 1

Details: Published: 11 September 2014

Every product has his oddities, which can be time consuming if you are not familiar with those characteristics of the product. Also XenApp 6.5 has some of those characteristics which are not well-known or not documented well in the Citrix documentation or specific situations I have encountered at customers environment. In this article I will write down situations encountered at XenApp implementations at customers including a solution, work around or the way you should work with it.

The two not much mentioned components in a PVS High Available infrastructure

Details: Published: 16 July 2014

Just as almost every product and solution PVs can be set-up and configured so the PVS infrastructure is high available. Within the PVS infrastructure there are several components related to the High Availability of PVS. Some of these components like PXE and TFTP are well described in several good articles for creating a High Available solution. However within the PVS infrastructure there are also some components/configurations settings that are not much mentioned around the HA topic, but can have a big impact on the High Availability of your PVS infrastructure. In this article I’m going to describe which components should be taken into account, why and how you could/should use them in a High Available PVS infrastructure.

Advanced Citrix Load Balancing Scenarios with Worker Groups

Details: Published: 24 June 2014

In the article Citrix Load Balancing Policies explained I described where and how to use Citrix Load Balancing. One of the most used scenarios is redirecting user to a specific group of servers defined in a Worker Group. At some customers we were also using Citrix Load Balancing for that use case, but during those projects some additional concepts were introduced and we should get it working with the already defined Load Balancing Policies. In this article I’m going to describe the scenarios and how that can be accomplished with the defined Load Balancing policies.

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