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Virtualization and Cloud

Jonathan Gershater

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Top Stories by Jonathan Gershater

Following my initial introduction to Hadoop and overview of Hadoop components, I studied the Yahoo Hadoop tutorial,  and have a deeper understanding of Hadoop. I  would like to share my learning and help others understand Hadoop. Why does Hadoop require HDFS, what's wrong with NFS? Normal 0 false false false EN-US JA X-NONE Nothing! NFS been around for years and is incredibly stable. A distributed file system, such as NFS, provides the functionality required for servers to share files. It does this by exposing a volume to the network, which users connect to over the TCP/IP protocol. For Hadoop applications that require highly available distributed file systems with unlimited capacity HDFS is preferred. The following table outlines where NFS is deficient for Hadoop and where HDFS solves the limitation. NFS limitation Hadoop optimization What happens when the volume ... (more)

Cloud Computing Easily Understood - SaaS

In prior blog posts, I described Infrastructure as a Service (IaaS) and Platform as a Service (PaaS). To recap: If I use IaaS I get servers onto which I can load software and applications which I then maintain, though I don't need to maintain the hardware. I can customize the applications and software running on the servers, at will. If I use PaaS, I get a platform of ready to use web servers, application servers, databases etc. I write my own software application and host it at the PaaS provider. I maintain the software I write, but not the application servers, databases or ha... (more)

Examining Excellent Eucalyptus

Eucalyptus is an open source Infrastructure as a Service cloud offering. What is unique about Eucalyptus is that it is compatible with Amazon AWS APIs. This means that you can: Use Eucalyptus commands to manage Amazon or Eucalyptus instances. Freely move instances between a Eucalyptus private cloud and the Amazon Public cloud to create a hybrid cloud. Eucalyptus leverages operating system virtualization, such as KVM or XEN, to achieve isolation between applications and stacks. Operating system virtualization dedicates CPU and RAM to systems and applications such that they don't ... (more)

Four Minute Lesson on Infrastructure as a Service

As a follow up to my article on Infrastructure as a Service, here is a four minute video: http://www.youtube.com/watch?v=q6u-KkD53_Y   ... (more)

Review of Microsoft Azure IaaS

Following my introduction to Infrastructure as a Service (IaaS), I published a review Microsoft Azure IaaS on the WindowsITPro website here: http://windowsitpro.com/windows-azure/overview-windows-azure-infrastructure-service My article is also currently appearing on the main Windows IT Pro page, about a third of the way down the list Thank you to WindowsITPro and Penton Media for their assistance ... (more)