Citrix Systems Asia Pacific XenDesktop 2.0 Enterprise Edition
Citrix XenDesktop 2.0 leverages streaming applications, server virtualisation, and swift tools for a scalable and manageable virtual desktop infrastructure solution.
- Wizard-based approach to building and managing desktop VMs, write caching that during user sessions, Desktop Delivery Controller, quick updating of VMs
- XenServer still not on par with VMware ESX
Citrix has long been the leader in the terminal services/remote desktop game. Its ICA protocol is heads and shoulders above alternatives, and the manageability of its solutions continues to be strong. By coupling this existing technology with VDI, Citrix aims for the best of both worlds, delivering streaming and hosted applications to a small-footprint desktop VM. XenServer still lags the capabilities of the VMware ESX hypervisor, but XenDesktop does not require XenServer to function and will play nice with VMware and even Microsoft Hyper-V.
Price$ 295.00 (AUD)
This would seem to be the primary reason Citrix acquired XenSource. The company clearly saw the opportunity to tie its application streaming and hosting technologies to a virtualised infrastructure to reduce these problems. So far, Citrix has done pretty well.
Pieces and parts
To picture how Citrix XenDesktop works, you need to understand the various components. Obviously, there's a hypervisor that handles the VMs themselves. Citrix XenDesktop is built around XenServer, but can play with VMware VI3 as well as Microsoft's Hyper-V. Then there are the management tools, provided by XenDesktop Provisioning Server and XenDesktop Desktop Delivery Controller.
The Provisioning Server is a major component within XenDesktop. It serves as the central proxy for all desktop VM vdisks (virtual disks) and allows administrators to build, configure, and manage all the desktop VMs. The wizard-based approach to building and managing those VMs is well appointed, and handles nearly everything fairly seamlessly. Building large groups of VMs is simple: Create a "gold" VM disk that contains the OS, all supporting applications, and settings, and is joined to an Active Directory domain, and then create a VM template that sets the RAM requirements, I/O devices, and so forth. Once that's done, you can easily create one or more VMs from that image to be served to users as desktops. In this way, it takes no more time to create 20 VMs than it does to create a single VM.
The Provisioning Server is also the key to managing all the write caching that occurs during user sessions. Write caching is an important aspect of Citrix's VDI infrastructure. When a user logs into a session on a VM, changes made to the OS itself are not written to the VM, but to a write cache that lives on a shared LUN or other shared storage medium. This allows the user to make changes that are not retained when the VM is rebooted. This maintains the integrity of the VM and is also helpful in reducing the chances of malware infiltrating the infrastructure. If something is amiss, simply reboot the VM to a known-good state. The Provisioning Server is relatively smart, and is capable of not only provisioning new desktop VMs but also adding them to the AD domain on the fly.
Citrix estimates that a single physical Provisioning Server can handle between 350 and 500 simultaneous XenDesktop users.
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