Günther Gerlach

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Every time a project is initiated there is no understanding, time-consuming effort to write down all foreseeable tasks or requirements. Usually, a project writes down what is obvious, which is almost always more than enough for a first sprint. The Product Backlog is then allowed to grow and change as more is learned about the product and its customers.

Gunther Gerlach

Basically, moving to the cloud it shouldn’t impact your architecture with many changes as we believe. If your platform has a well design architecture based on independent layers (UI, Logic, Data, etc), adapting to work in a Cloud environment only mean to add a new layer of virtual environments to your n-tiers environment. Moving to the Cloud only become a problem when solutions don’t have a solid and well designed architecture and basically they are pushed back at the moment to adapt to this new age of technology.

Gunther Gerlach

written by gunther gerlach-2009

I have talked about virtualization and also about Cloud Computing but, what options are available to implement cloud computing Infrastructure implementations? Well, that is simple!

 

 

Hardware technologies for virtualization (hypervisor)

Hypervisor Virtualization has a layer (usually a thin Linux kernel shown here as a hypervisor or standard OS) that is loaded directly on the bare server. To allocate hardware and resources to the virtual machines (VMs), all hardware on the server must be virtualized. The next layer up shows each chip, board, etc. that must be virtualized so that it can be assigned to the VMs. Once in the VM itself, there is a complete copy of an operating system and finally the application or workload.

Gunther Gerlach

EXECUTIVE LEADERSHIP: World-Class Development Organizations, Web-Services, E-Commerce, IT Operations, Scalable Cloud Computing, Tier-1 Systems.

Gunther Gerlach

written by gunther gerlach-2009

Evolving application architectures just as P have shown that cloud computing is a natural extension of current trends and best practices, the same is true when viewing cloud computing from an architectural perspective. Again, cloud computing is nothing new, yet in its implementation, it changes everything that we do.

Changing application designs In the past, applications were built to handle larger workloads through vertical scaling. Put more processors and memory on a mail server to handle a larger volume of traffic. Scale up a database server to increase throughput. Run high-performance computing jobs on a supercomputer.

Gunther Gerlach

written by gunther gerlach-2009

A user story describes desired functionality from the customer (user) perspective. A good user story describes the desired functionality, who wants it, and how and why the functionality will be used.

The INVEST model define a User Story as Independent, Negotiable, Valuable, Estimable, Small, Testable. Let’s see what each one means:

Independent - One user story should be independent of another (as much as possible). Dependencies between stories make planning, prioritization, and estimation much more difficult. Often enough, dependencies can be reduced by either combining stories into one or by splitting the stories differently.

Gunther Gerlach