Simplify your XenAppXenDesktop with DNS aliases

Citrix, VMware
You can see this recommendation in few of our recent best practices – most recently in the excellent “XenDesktop and XenApp Best Practices document”: “The XenDesktop and XenApp servers should be configured to use DNS Aliases when accessinginfrastructure components such as the Citrix License Server and Database Server(s) rather than hostname or IP address. This helps to simplify management during certain maintenance and disaster recovery scenarios.” But what does it exactly mean and how should it be configured? I’m following this best practice for many years and I would like to share few information about how to use it and what are the benefits. (more…)
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Slow Web InterfaceMMC console? CRL explained

Citrix
This is actually very common problem in many environments – Web Interface andor particular consoles (mostly MMC-based) are slow to start – there is actually KB article that describes a workaround for this issue. I consider this to be one of the tweaks that many people often implement, but don’t really understand the consequences and the reasons why it helps, so I’ve decided to write a small blog post about this topic. What is certificate revocation list? So, you’ve got your certificate issued, right? But now you can ask yourself – what should I do in case that certificate was compromised and I quickly need to revoke it? This is the primary purpose of Certificate Revocation List (CRL). It allows you to quickly check if the certificate is still valid…
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Slight change in “restart” behavior for HA with vSphere 5.0 Update 1

VMware
Although this is a corner case scenario I did wanted to discuss it to make sure people are aware of this change. Prior to vSphere 5.0 Update 1 a virtual machine would be restarted by HA when the master had detected that the state of the virtual machine had changed compared to the “protectedlist” file. In other words, a master would filter the VMs it thinks had failed before trying to restart any. Prior to Update 1, a master used the protection state it read from the protectedlist. If the master did not know the on-disk protection state for the VM, the master did not try to restart it. Keep in mind that only one master can open the protectedList file in exclusive mode. In Update 1 this logic has…
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vSphere 5.0 HA restarting of VMs with no access to storage?

VMware
I had a question today around the restart of VMs with no access to storage by HA. The question was if HA would try to restart the VM and time out after 5 times. With the follow up question, if HA would try again when the storage would return for duty. By default HA will try to restart a VM up to 5 times in roughly 30 minutes. If the master does not exceed it will stop trying. On top of that HA manages a “compatibility list”. This list will contain the details around which VM can be restarted and where. In other words; which hosts have access to the datastores and network portgroup required for this VM to successfully power-on. Now if for whatever reason there are no compatible…
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Cool tool update: RVTools 3.3 released!

VMware
Rob de Veij just published RVTools 3.3. I know many of you are using it and I definitely suggest downloading the latest version! RVTools has been downloaded more than 100.000, so definitely worth checking out if you had not so far! Here are the changes in this release: Version 3.3 (April, 2012) GetWebResponse timeout value changed from 5 minutes to 10 minutes (for very big environments) New tabpage with HBA information On vDatastore tab the definition of the Provisioned MB and In Use MB columns was confusing! This is changed now. RVToolsSendMail accepts now multiple recipients (semicolon is used as separator) Folder information of VMs and Templates are now visible on vInfo tabpage Bugfix: data in comboboxes on filter form are now sorted Bugfix: Problem with api version 2.5.0 solved Bugfix: Improved exception…
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