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Cloud Computing Service Models
A look at the three different service models for cloud computing as defined by NIST

In this post I will look at the three different service models for cloud computing as defined by NIST. More specifically I will look at the management and operations overhead for each one of the models and compare it to the traditional on-premise model.

Traditional Model

Let's look at how things have been done in the past. Traditionally enterprises have been responsible for managing their own IT infrastructure as well as the software stack that runs their applications. For small companies that meant hiring polyglot employees with wide range of skills varying from low level networking to high level application support. For larger ones, that can afford more staff, it meant creating specialized teams responsible for only networking infrastructure, or only storage or servers and virtualization. However for lot of those enterprises the core business has never been managing IT infrastructure - the only thing they are interested in is to manage their line-of-business (LOB) apps.

Cloud Service Models

Here are just some of the tasks IT teams enterprises have been required to do in the past:

  • Build racks with servers and wire them into the network
  • Build storage arrays and wire them into the network
  • Configure routers
  • Configure firewalls and DMZ zones
  • Install operating system software on the servers
  • Create virtual machines (if virtualization is utilized)
  • Install operating system software on the virtual machines
  • Install databases, set up replication and backups
  • Install middleware used for hosting the application code
  • Patch and update operating system software
  • Patch and update databases
  • Patch and update middleware
  • Patch and update runtime
  • Install application software
  • Patch and update application software

Although long this is by no mean the complete list of tasks that IT personnel has been responsible for. From the list above only the last two (install application software and update application software) have been essential to the core business of the enterprise. In addition to the IT operational costs (OpEx) enterprises also incurred significant capital expenditures (CapEx) used to procure the necessary hardware.

More than a decade ago hosting providers recognized the need to help businesses with those tasks and allowed them to outsource the build-up of infrastructure, and concentrate on just managing their applications. Although hosting providers helped enterprises with OpEx and CapEx they still lacked some of the essential cloud characteristics like on-demand self-service, rapid elasticity and measured service as outlined in Essential Cloud Computing Characteristics.

Infrastructure-as-a-Service (IaaS) Model
IaaS model was the first model that complies with NIST cloud computing characteristics. In essence it offers cloud computing environment consisting of virtual machines. It offers self-service portal where you can on-demand start a virtual machine with preferred operating system, it is broadly accessible, elastic (you can easily start identical virtual machine or shut down exiting one), it uses pool of virtual machines that are collocated on common hardware, and at the end it measures your usage of those virtual machines.

If you look at the picture above you will see that the IaaS model provides automation in the lower layers (up to the virtualization layer) of the application stack. What that means is that tasks like starting the virtual machine, adding it to the network, configuring the routing and the firewalls and attaching storage to it is automatically done by the automation software. The vendor that provides the service is also responsible for managing any hardware failures and service the underlying hardware.

As you have already noticed the IaaS model provides cloud services up to the virtualization layer of the application stack. However as a consumer of the IaaS service you are still responsible for managing the virtual machine. Hence you are still responsible for patching and updating the operating system on the VM, installing and maintaining any databases or middleware that your application uses in addition to maintaining your actual application.

IaaS is very similar to the traditional hosting model with the added benefits of self-service, elasticity and metering.

Platform-as-a-Service (PaaS) Model
With PaaS you have much less things to worry about. As you can see from the picture the whole stack needed for your application is managed by the vendor. Your only responsibilities are your application and the data your application uses. In addition to the tasks managed in IaaS case the vendor (or in the case of private PaaS the platform owner) is also responsible for patching and updating the operating system, installing and maintaining the middleware as well as the runtime your application uses.

One important thing that you need to be aware of when using PaaS is that the automatic updates the vendor does may sometimes have negative impact on your application. Why is that? Very often OS and middleware vendors do incompatible changes between versions of their software. If your application depends on any underlying OS and middleware functionality it may break between platform updates. And because you are not in control of those updates you may end up with your application being down.

The premise of PaaS though is not only to offer maintenance free application stack but also additional services that you can utilize in your application. Very often PaaS providers are exposing middleware and databases as services and abstract the connectivity to those through APIs in order to free up developers from the need to locate the actual systems. Additional services can be authentication and authorization, video encoding, location based services etc. Using the PaaS services will allow you to abstract your applications from the underlying stack and as long as the APIs are kept intact it will be protected from failures between platform updates.

Software-as-a-Service (SaaS) Model
SaaS is the model with the highest abstraction and offers the most maintenance free option. As a SaaS consumer you are just using the software offered by the vendor. As depicted on the picture the whole stack is maintained by the vendor. This includes also updates for the application as well as application data management. SaaS model is very similar to the off-the-shelf software model where you go and buy the CD, install the software and start using it.

Traditionally one of the hardest problems application developers had to deal with was the data migration between different versions. SaaS vendors are also responsible for migrating your data and keeping it consistent. Similar to the off-the-shelf software model you can rely that you can access and read your data once you upgrade to a new version.

The SaaS model is the most resource-efficient model because it utilizes application multi-tenancy. What this means is that the same application instance handles multiple user-organizations. This is good for both the vendor and the customer because better resource utilization brings the maintenance costs down and hence the price for the services down. On the other side though tenant data is comingled and there is the security risk of one tenant accidentally getting access to another tenant's data.

Although not exhaustive the cloud computing service models explanation above should be enough to kick-start your initial discussion about your cloud strategy.

Read the original blog entry...

About Toddy Mladenov

Toddy Mladenov has more than 15 years experience in software development and technology consulting at companies like Microsoft, SAP and 3Com. Currently he is a CTO of Agitare Technologies, Inc. - a boutique consulting company that specializes in Cloud Computing and Big Data Solutions. Before Agitare Tech Toddy spent few years with PaaS startup Apprenda and more than six years working on Microsft's cloud computing platform Windows Azure, Windows Client and MSN/Windows Live. During his career at Microsoft he managed different aspects of the software development process for Windows Azure and Windows Services. He also evangelized Microsoft cloud services among open source communities like PHP and Java. In the past he developed enterprise software for German's software giant SAP and several startups in Europe, and managed the technical sales for 3Com in the Balkan region.

With his broad industry experience, international background and end-user point of view Toddy has an unique approach towards technology. He believes that technology should be develop to improve people's lives and is eager to share his knowledge in topics like cloud computing, mobile and web development.



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Cloud Expo - Cloud Looms Large on SYS-CON.TV


Cloud Expo 2013 East Opening Keynote by IBM
In this Cloud Expo Keynote, Danny Sabbah, CTO & General Manager, Next Generation Platform, will detail the critical architectural considerations and success factors organizations must internalize to successfully implement, optimize and innovate using next generation architectures.
Lisa Larson, Vice President of Enterprise Cloud Solutions of Rackspace Hosting Live From New York City
In the old world of IT, if you didn't have hardware capacity or the budget to buy more, your project was dead in the water. Budget constraints can leave some of the best, most creative and most ingenious innovations on the cutting room floor. It's a true dilemma for developers and innovators – why spend the time creating, when a project could be abandoned in a blink? That was the old world. In the new world of IT, developers rule. They have access to resources they can spin up instantly. A hybrid cloud ignites innovation and empowers developers to focus on what they need. A hybrid cloud blends the best of all worlds, public cloud, private cloud and dedicated servers to fit the needs of developers and offer the ideal environment for each app and workload without the constraints of a one-size-fits-all cloud.

Keynote: Driving Cloud Innovation: SSDs Change Cloud Storage Paradigm
Cloud is a transformational shift in computing that can have a powerful effect on enterprise IT when designed correctly and used to its full potential. Join Citrix in a discussion that centers on building, connecting and empowering users with cloud services and hear examples of how enterprises are solving real-world business challenges with an architecture and solution purpose-built for the cloud.

Go Beyond IaaS to Deliver "Anything As a Service"
Many organizations want to expand upon the IaaS foundation to deliver cloud services in all forms—software, mobility, infrastructure and IT. Understanding the strategy, planning process and tools for this transformation will help catalyze changes in the way the business operates and deliver real value. Join us to learn about the new ITaaS model and how to begin the transformation.


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[June 11-14, 2012]

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Introducing Big Data Expo
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There is little doubt that Big Data solutions will have an increasing role in the Enterprise IT mainstream over time. Get a jump on that rapidly evolving trend at Big Data Expo, which we are introducing in June at
Cloud Expo New York.

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Testimonials
Cloud Expo was a fantastic event for CSS Corp - we easily exceeded our objectives for engaging with clients and prospects."
AHMAR ABBAS
SVP, Global Infrastructure Management, CSS Corp.
 
With our launch at Cloud Expo, we successfully transformed the company from a relatively unknown European player into the dominant player in the market. Our competitors were taken by surprise and just blown away. We got a huge number of really high quality leads..."
PETE MALCOLM
CEO, Abiquo
 
We were extremely pleased with Cloud Expo this year - I’d say it exceeded expectations all around. This is the same info we got from partners who attended as well. Nice job!"
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Director of Marketing, UnivaUD
 
Cloud Expo helps focus the debate on the critical issues at hand in effect connecting main street with the next frontier."

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@CloudExpo Blogs
"Appcore has been around since January 2008. We exclusively built clouds for service providers. We've been working with CloudStack since about that same time and our software sits on top of CloudStack," stated Jeff Tegethoff, CEO of Appcore, in this SYS-CON.tv interview at 15th Cloud Expo, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
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Not only will the Patriots take on the Seattle Seahawks in the big game, but many web based companies will be taking on large-scale traffic challenges after airing their prime time commercials that day. After hearing this, you should ignore the pregame hype, put down the nachos and get your servers ready for maxxed out user load.
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SYS-CON Media announced today that Plutora launched a blog feed on DevOps Journal with over 3,500 story reads in less than a week. DevOps Journal is focused on this critical enterprise IT topic in the world of cloud computing. DevOps Journal brings valuable information to DevOps professionals who are transforming the way enterprise IT is done.
“Solr or Elasticsearch?”…well, at least that is the common question I hear from Sematext’s consulting services clients and prospects. Which one is better, Solr or Elasticsearch? Which one is faster? Which one scales better? Which one can do X, and Y, and Z? Which one is easier to manage? Which one should we use? Which one do you recommend? etc., etc. These are all great questions, though not always with clear and definite, universally applicable answers. So which one do we recommend you use? How do you choose in the end? Well, let me share how I see Solr and Elasticsearch past, pres...
In today’s highly connected world, the benefits and widespread adoption of cloud computing are not just limited to enterprises and government agencies; its transformative impact has prompted changes to a variety of businesses across several verticals – both big and small. In fact, a recent study by Emergent Research, ‘Small Business Success in the Cloud,’ found that the percentage of U.S. small businesses using cloud computing is expected to grow by more than half, from 37 percent to nearly 80 percent, by the year 2020.
Apache Drill is an open source, schema-free SQL query engine—that enables a business to extract the most value possible from data stored in Hadoop. Apache Drill does this by breaking down many of the technical barriers that had restricted the ways that analysts could work with data, and limited the intelligence that they could glean from it. With Apache Drill, data scientists are no longer constrained by the limitations of last generation tools, and they are free to work with data in a myriad of productive ways without draining IT resources.
"There is a natural synchronization between the business models, the IoT is there to support ,” explained Brendan O'Brien, Co-founder and Chief Architect of Aria Systems, in this SYS-CON.tv interview at the 15th International Cloud Expo®, held Nov 4–6, 2014, at the Santa Clara Convention Center in Santa Clara, CA.
In Part I of this blog I explained which metrics on the Web Server, App Server and Host allow me to figure out how healthy the system and application environment is: Busy vs. Idle Threads, Throughput, CPU, Memory, etc. In Part 2, I focus on the set of metrics captured from within the application server (#Exceptions, Errors, etc.) as well as the interaction with the database (connection pools, roundtrips to database, amount of data loaded, etc.). Most of the screenshots shown in this blog comes from real performance data shared from our Dynatrace Free Trial users that leveraged my Share Your P...
As the pace of development and business continues to scale, teams need an agile and collaborative work environment to succeed. Moving to a DevOps model is a critical part of setting your engineering teams up to succeed, but making the transition can be challenging for many companies. DevOps is a movement in the software world that focuses on collaboration between developers and operations, customer empathy and infrastructure automation. In traditional models, developers write code and then hand it to operations teams to deploy and and run in a production environment. This often leads to a la...
With Dell’s acquisition of Quest and all the IT reorganization that followed, it is actually not that easy to find these two popular free PowerShell tools any longer. So here are the links that work today (January 30, 2015)
It’s been only a handful of months since my fellow Forbes pundits Mike Kavis and Ben Kepes bemoaned cloud provider Rackspace’s troubles competing in the cutthroat public cloud marketplace. “Companies like Rackspace simply cannot compete,” opined Kavis in July 2014. Back in May, Kepes snarkily pointed out that “Rackspace has long been something of a bridesmaid,” as they unsuccessfully explored selling themselves to the highest bidder. Yet, just as reports of Mark Twain’s death were exaggerated – or perhaps Monty Python’s “not dead yet”? – just so with San Antonio-based Rackspace Hosting, Inc. I...
If you're part of the decision making process in how to get started with Big Data then you've probably already discovered that open source Apache Hadoop has a big lead. You also know that unless you've got a particularly deep NoSQL team or want to write your own proprietary code that the free open source version of Hadoop is not for the great majority of businesses. You want the benefits of open source but with some support and some capabilities that tie the open source components together in an enterprise quality database system. You want a Hadoop Distribution.
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Past SYS-CON Events
    Cloud Expo West
cloudcomputingexpo
2011west.sys-con.com

 
    Cloud Expo East
cloudcexpo
2011east.sys-con.com

 
    Cloud Expo West
cloudcomputingexpo
2010west.sys-con.com

 
    Virtualization Expo West
virtualization
2010west.sys-con.com
    Cloud Expo Europe
cloudexpoeurope2010.
sys-con.com

 
    Cloud Expo East
cloudcomputingexpo
2010east.sys-con.com

 
    Virtualization Expo East
virtualizationconference
2010east.sys-con.com
    Cloud Expo West
cloudcomputingexpo
2009west.sys-con.com

 
    Virtualization Expo West
virtualizationconference
2009west.sys-con.com
    GovIT Expo
govitexpo.com
 
    Cloud Expo Europe
cloudexpoeurope2009.sys-con.com
 

Cloud Expo 2011 Allstar Conference Faculty

S.F.S.
Dell

Singer
NRO

Pereyra
Oracle

Ryan
OpSource

Butte
PwC

Leone
Oracle

Riley
AWS

Varia
AWS

Lye
Oracle

O'Connor
AppZero

Crandell
RightScale

Nucci
Dell Boomi

Hillier
CiRBA

Morrison
Layer 7 Tech

Robbins
NYT

Schwarz
Oracle

What The Enterprise IT World Says About Cloud Expo
 
"We had extremely positive feedback from both customers and prospects that attended the show and saw live demos of NaviSite's enterprise cloud based services."
  –William Toll
Sr. Director, Marketing & Strategic Alliances
Navisite
 


 
"More and better leads than ever expected! I have 4-6 follow ups personally."
  –Richard Wellner
Chief Scientist
Univa UD
 


 
"Good crowd, good questions. The event looked very successful."
  –Simon Crosby
CTO
Citrix Systems
 


 
"It's the largest cloud computing conference I've ever seen."
  –David Linthicum
CTO
Brick Group