|Next up on our sneak preview of the building block sessions for the Enabling cloud computing with WebSphere campaign is the Dynamic Infrastructure Services block. One portion of that block is a discussion about some of the technical capabilities of WebSphere Virtual Enterprise given by Nitin Gaur. Nitin is a Consulting IT Specialist within WebSphere, and an all-around WebSphere guru. I caught up with him to ask a few questions about his upcoming podcast.|
|Me: When people think cloud computing, one of the core concepts is 'on demand'. They want just enough resource at just the right time. In that sense, can you tell me a little about the On-Demand Router (ODR) in WebSphere Virtual Enterprise (WVE)? What is it and what core functions does it provide?|
Nitin: So, first allow me to take a step back. In my view, cloud computing is a new consumption and delivery model nudged by consumer demand and continual growth in internet services. I classify any Cloud computing platform exhibits the following 6 key characteristics:
I thus, deliberately use the term platform in the context of a cloud computing environment that facilitates flexibility, robustness and agility, as a systemic approach in providing a stage to hosting applications without the concern for availability or provisioning of underlying resources. Since hardware and software virtualization do offer significant cost and resource management advantages, it is not rare to see virtualized platforms as core building blocks of any cloud platform. Such virtualization technologies provide an elastic infrastructure service. In this respect, WVE provides application server virtualization, which enables an elastic business-policy-driven application infrastructure.
Now back to the On-Demand Router. The ODR is the autonomic engine that drives the activity enabling the elastic infrastructure discussed above. The ODR operates in a highly dynamic WVE environment, so it is imperative for the ODR to be aware of any changes in the environment such as newly deployed applications, the addition of new application servers, and any planned or unplanned server outages. It achieves this awareness by continuously interacting with WVE's fluid and dynamic feedback mechanism.
|Me: Autonomic capabilities seem to be a core part of WebSphere Virtual Enterprise. To that end, can you tell us a little about the autonomic capabilities provided by dynamic clusters in WVE?|
Nitin: Dynamic application placement is a defining capability of WVE that directly contributes to WVE's ability to provide a dynamic, virtualized, and goal-oriented environment for workload management and continuous availability. The dynamic application management capability maximizes the efficient use of hardware resources by allocating resources appropriately per application based on fluctuating demands in the enterprise infrastructure. It determines which servers to stop and start in a dynamic server cluster in order to meet current demand for applications, and it does this in the context of a set of administrator-defined policies that uphold the enterprise’s service level agreements (SLAs) for its application infrastructure. The dynamic application placement framework must balance resource availability against health policies, service policies, and the importance levels assigned to applications.
Dynamic server clusters are key to WVE’s ability to dynamically adjust the application environment according to server load, and they provide the basis for a virtualized server runtime environment. The big difference between a dynamic cluster in WVE and a static cluster in WebSphere Application Server is that dynamic clusters grow and shrink as needed to meet current demand by starting and stopping members of the cluster. Although dynamic clusters and static clusters can co-exist in a cell, dynamic application placement can only work with dynamic clusters. To prevent unchecked growth, each dynamic cluster has a mechanism that you use to define a boundary for that cluster’s growth. The boundary is both quantitative (based on criteria that define the minimum and maximum number of application servers that can run in the cluster simultaneously) and locational (based on criteria that confine the growth of the dynamic cluster to a defined set of nodes).
|Me: I know you have been around the country, and for that matter globe, helping our users to adopt and implement WebSphere Virtual Enterprise. Tell us about one of your favorite customer stories.|
Nitin: So I would cite an example of one of the leaders in the entertainment Industry (and my favorite customer), let's call them Company X (since I cannot cite the name). The core of the company's application infrastructure system is the Sales App Infrastructure (SAI) consisting of more than 10 enterprise applications. To keep up with demand, Company X was required to procure more hardware and software to support the core systems. This strategy resulted in a large infrastructure footprint with low hardware utilization. The increase in hardware footprint became difficult to manage and required additional resources. The large footprint of the company's deployment put them in reaction mode rather than a posture of proactive monitoring. Some application servers rendered themselves unavailable and required the team to restart them every 24 hours. From a cost standpoint, it costs the company the same amount of money to request a virtual platform as it would to purchase a new physical server. This led to significantly under utilized hardware throughout the enterprise. WVE was brought in to Company X to help better manage their WebSphere Application Server footprint. Dynamic clusters, application health policies, and application editioning features helped the company to better utilize hardware, reduce hardware expenditures, increase visibility into their applications, and improve availability of their applications.
In addition to helping with the existing environment, WVE helped Company X to roll out a new project with applications that required continuous availability to worldwide users. The team made use of policy-based workload management to ensure performance and availability levels of these new applications met their business needs. In addition, the company was able to reduce the amount of WebSphere Application Server licenses and physical servers required for this new deployment. In sum, WebSphere Virtual Enterprise saves the company significant time, money, and management effort.
|Me: Thanks Nitin for your time!|
|Don't forget to check out the ongoing Enabling cloud computing with WebSphere campaign for webcasts, podcasts, and more.|
|-- Dustin Amrhein|
A view from the clouds: Cloud computing for developers
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