Why is Citrix refusing License Server VPX support for vSphere?

Written by Ingmar Verheij on February 5th, 2013. Posted in Citrix

With the release of Citrix XenServer 5.6 Citrix also released a new virtual appliance dedicated to licensing, the License Server VPX. The appliance is available since July 2010, in the 2.5 years the appliance is available only Citrix XenServer is supported.

Citrix ReadyIf you’re company is using VMware vSphere (or Microsoft Hyper-V) you’re unable to use the virtual appliance. Citrix refuses to release an appliance for other hypervisors then their own, let alone supporting other hypervisors. Technically it shouldn’t be too difficult to support other hypervisors (some people tried), they already do for the NetScaler VPX.

Who needs ISO for Citrix Provisioning Services?

Written by Ingmar Verheij on February 5th, 2013. Posted in Provisioning Server

In a previous article I wrote that for streaming vDisks to endpoint you don’t necessarily need PXE, you can also attach an ISO to the virtual machine (“Who needs PXE for Citrix Provisioning Services?”). Although this eliminates the dependency for a PXE server (which is challenging to make high available), mounting an ISO file to the CD rom of a virtual machine creates another problem in some hypervisors.

When a hypervisor host needs maintenance a (storage) vMotion is a good way of moving all systems with no downtime. Mounting an ISO file breaks the ability to vMotion with some hypervisors.

Citrix XenServer and VMware vSphere 5 (Hyper-V I’m not sure of) can mount ISO files from shared storage, so this does not apply to all situations.

Fortunately the bootstrap can also be placed on a virtual hard disk (VHD). In this article I’ll guide you step-by-step how this is done. In this example I’m using VMware vSphere 5 but most steps are equal for other hypervisors.

You don’t need XenDesktop for a virtual desktop

Written by Ingmar Verheij on February 1st, 2013. Posted in XenApp (Presentation Server), XenDesktop

XenDesktop 7For years Citrix has a product to host applications from a centralized locations offering great flexibility and efficiency, called Citrix XenApp. In 2008 Citrix released XenDesktop, the VDI solution from Citrix. With this first release of XenDesktop it was possible to (only) publish a desktop hosted on a single user operating system (like Windows XP, Vista or 7).

Citrix has tried to choose an appropriate name for their products to help customers understand what product offers what solution (and reducing the ridiculous times they rename their products). Although this is an admirable attempt they failed to reach that goal.

A lot of customer assume that with XenApp they can (only) publish applications and with XenDesktop (only) desktops, how wrong can they be?

Netscaler X – Connection limit to CFE exceeded

Written by Ingmar Verheij on August 27th, 2012. Posted in Netscaler

Connection limit to CFE exceededWhen you try to connect to the admin console (dashboard) of a NetScaler X you get the error “Connection limit to CFE exceeded”. If you login via SSH is seems the credentials are invalid.

Users with a different username are able to login. In this example vtsha_admin is unable to login, nsroot can login..

Who needs PXE for Citrix Provisioning Services?

Written by Ingmar Verheij on August 24th, 2012. Posted in Provisioning Server

With Citrix Provisioning Services (PVS) the content of a disk can be streamed to a (virtual / physical) machine via the network. A (virtual) machine that boots needs a bootstrap to locate a PVS server (that has a vDisk available) and the ability to stream the disk to the machine.

The bootstrap, the Boot Device Manager (BDM), needs to be delivered to the machine. It is common to deliver the BDM bootstrap via a Pre Execution Environment (PXE) network boot, but it’s not required. Although the PXE method seems the most straight forward method (and most advocated), it it  difficult to make it resilient.

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