Systems Alliance Blog

Opinion, advice and commentary on IT and business issues from SAI
Keyword: citrix

I'm pretty sure data center managers dream of a day when the server platform (hardware or virtual) they buy can come from any manufacturer. And applications can be moved seamlessly from box-to-box with the click of a mouse. That dream is becoming more of a reality every day. HP and Cisco have created hardware platforms that allow application movement from server to server with a simple reboot, albeit only on their hardware. The hypervisor vendors, VMware, Citrix and Microsoft can move servers seamlessly from virtual server to virtual server with little or no downtime. Dell has taken this idea a step further with the Advanced Infrastructure Manager (AIM) product. With AIM, you can move a server “persona” between virtual and physical platforms with the same ease as HP and Cisco offer, but across heterogeneous hardware and hypervisor platforms. Sounds like a dream come true to me.

An AIM persona encapsulates a portable SAN and network server identity and combines it with a bootable shared storage image to enable cross-platform server mobility. They can run on bare-metal hardware or as a virtual machine in a hypervisor. Depending on your view of the value a particular hardware or virtualization software vendor brings to your environment, a solution like this could significantly change the landscape of your data center. Application migrations between hardware platforms can become as easy as bringing the server under AIM management and rebooting the persona into the new computing environment. Painful platform migrations become a thing of the past.

Another great use case for this technology?
The fast deployment of new applications.
Envision a scenario where a new application is rolled out and the application owners and IT staff don't understand the server requirements to run the application properly. A virtualized infrastructure persona could be run on a server where the load requirements could be modeled and a determination quickly made whether the computing architecture was correct. If it wasn’t, shutdown the server, boot it on a smaller/larger server or in a virtual machine, and you have a completely new computing environment that is closer to your real-world requirements.

Implementing AIM functionality doesn’t come without some up front work. This technology leverages a shared storage network and in most cases, the ability to boot images from the SAN. Many organizations limit the servers they have attached to shared storage because of the additional expense, and very few implement boot from SAN. Environments where server capacity is dynamic, or quick recovery of a hardware failure is required would provide the most return on investment.

Ok, like all dreams you're going to wake up sooner or later, and then what? Well, how about scheduling a white-board session with our engineering team to evaluate opportunities for deploying AIM in your environment. Ping me here to schedule a session.

Today, many of you are taking the plunge and getting VDI projects off the ground.  In fact, in 2010 we’ve seen a record number of VDI proof-of-concepts (POCs) started by clients. And, so far, most have had great success deploying VDI in LAN environments.

But what about deploying VDI to remote offices over a WAN?  If you’re considering VDI over a WAN for your enterprise, and based on all the potential benefits (cost, operational, security, etc.) you should, I recommend you first do some homework by answering the following questions:

1.     Does our LAN network protocol support WAN VDI deployment? 

2.     Will we be deploying thin-client terminals as the end-user devices on our WAN? 

3.     Will the network protocol I use handle the network latency of the WAN network link?

4.     How will the quality of my end-user experience change from LAN to WAN?

5.     Does our network protocol support multimedia across the WAN?

6.     Does my WAN have adequate bandwidth to support VDI at my remote offices?

Obviously, you want to pick to a VDI environment (VMware, Citrix, Microsoft, Sun/Oracle and etc.) that will support both a LAN and WAN deployment with little if any architecture redesign.  Based on my personal testing, the following protocols work well in both LANs and WANs:

There is not any network standard available today for deploying VDI over WAN, so the protocols mentioned above can only be used with the software and hardware supported by their respective vendors.  Each has its pros and cons for deploying in a WAN environment.  ALP, HDX and PC-over-IP have built-in WAN optimization capabilities.  ALP can be further optimized for WAN deployment – we’ve had excellent success using the Silver Peak WAN acceleration appliance for this purpose. Silver Peak uses de-duplication and compression to reduce bandwidth utilization by 20% to 30%.

The process of assembling a VDI environment to support your LAN and WAN users can be daunting.  My approach often begins with a proof-of-concept (POC) “bake off” between the VDI vendors that best fit my requirements.  You’ll want to establish requirements early in the process, before the POC is even started. Likewise, you’ll need evaluation criteria addressing end-user business issues, as well as technical requirements. Once you’re satisfied with the outcome of the POC, you can pilot the chosen solution and see if it can really live up to your expectations in a WAN scenario. 

At Systems Alliance, we use a four-step process for deploying VDI technology:

1.     Build the business case

2.     Design / architect the solution

3.     Deploy the POC/Pilot

4.     Production roll out

As a part of our process, we’ll hold a workshop to get details about a client’s environment, goals, high-level requirements, success criteria and risks. We sometimes conduct pre-POC assessments to better understand the environment and user patterns – Liquidware Labs Stratusphere is extremely useful for this purpose.  Taking these steps helps ensure the success of the POC /Pilot and accelerates the rollout of the production environment.

So the answer to the question, Is VDI Ready For WAN Use? is a definite, YES!

If you’re thinking VDI might be right for your remote offices, I encourage you to request a VDI assessment from Systems Alliance now.

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