Some concerns about deploying a private cloud in .NET

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Some concerns about deploying a private cloud
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Before you or anyone jumps to deploying a private cloud, let s assess a quick set of four major concerns.
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PRIVATE CLOUDS ARE SMALL SCALE
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Why do most innovative cloud-computing providers have their roots in powering consumer web technology Because that s where the big numbers of users are. Few corporate data centers see anything close to the type of volume seen by these vendors. And, as you ve seen, volume drives costs down through the huge economies of scale.
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LEGACY APPLICATION DON T CLOUDIFY EASILY
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Legacy applications moved to a private cloud will see marginal improvements at best.
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Security and the private cloud
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You can achieve only so much without rearchitecting these applications to a cloud infrastructure.
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ON-PREMISES DOESN T NECESSARILY MEAN MORE SECURE
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The biggest drivers toward private clouds have been fear, uncertainty, and doubt about security. For many, it feels more secure to have your data behind your firewall in a data center that you control. But unless your company spends more money and energy thinking about security than Amazon, Google, and Salesforce, that isn t true.
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DO WHAT YOU DO BEST
Do you think there s a simple set of tricks that an operator of a data center can borrow from Amazon or Google No way. These companies make their living operating the world s largest data centers. They re constantly optimizing how they operate based on real-time performance feedback from millions of transactions. Although you can try to learn from and emulate them (hard to do because they protect their trade secrets as if national security depended on it!), your rate of innovation will never be the same private clouds will always be many steps behind the public clouds.
Private cloud deployment options
If, despite these concerns, you plan to proceed down the private cloud path, you have several options available for building your private cloud. As discussed earlier, for companies and organizations that can acquire and provision hardware and data-center resources efficiently enough, a private cloud may make sense. In addition to the capital costs for hardware, an organization needs to determine its strategy with respect to the software infrastructure it ll use to operate and manage the cloud. The costs involved vary substantially and can range from free if you adopt an open source approach to over $1 million for a full-service offering that includes proprietary software and architecture, design, and implementation services. Table 4.2 summarizes the possible private cloud implementation categories and example vendors/solutions.
Table 4.2 Private cloud deployment options by type Example vendors Eucalyptus, OpenNebula VMware, Enomaly, Appistry Description Free software for creating a private cloud implementation, primarily on UNIX-based systems Proprietary private cloud solutions open with a specific strength in a core cloud technology, such as virtualization, storage, or management Dedicated hardware hosted in a cloud model for a single customer, built using either open source or a proprietary solution Specialty providers or practice areas in large firms dedicated to architecture, design, and deployment of private clouds
Provider type Open source Proprietary software Hosted offering
Savvis, OpSource, SunGard
System integrator
Appirio, Accenture, Infosys
Rationale for a private cloud
DO-IT-YOURSELF PRIVATE CLOUDS/OPEN SOURCE
The public cloud providers have primarily implemented their solutions with a combination of open source and homegrown software. Their user-facing APIs are publicly visible, but they haven t released the core technologies for operating and managing their clouds. Eucalyptus and OpenNebula are two open source initiatives, both offshoots of university research projects, that have created software to replicate the homegrown software of the large public cloud providers. They provide a software capability for provisioning and managing a multiuser private cloud built on top of commodity hardware. They ve also made their solutions compatible with the APIs provided by Amazon. Using these software solutions allows you to create an interoperable infrastructure that can work as a hybrid cloud. They re open source initiatives and, unlike proprietary approaches, there s no specific incentive (such as having you buy more of their software) to create lock-in; and you have unlimited flexibility as usual and with the same regular caveats around support and usability. Constructing a private cloud using open-source technologies requires a high degree of technical sophistication and probably works best in organizations that have a history of working with open source on other projects.
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