ScalabilityInfrastructure capacity allows for traffic spikes and minimizes delays.ResiliencyCloud providers have mirrored solutions to minimize downtime in the event of a disaster. This type of resiliency can give businesses the sustainability they need during unanticipated events.Homogeneity: No matter which cloud provider and architecture an organization uses, an open cloud will make it easy for them to work with other groups, even if those other groups choose different providers and architectures.On-demand self-service. A consumer can unilaterally provision computing capabilities, such as server time and network storage, as needed automatically without requiring human interaction with each service’s provider. Broad network access. Capabilities are available over the network and accessed through standard mechanisms that promote use by heterogeneous thin or thick client platforms (e.g., mobile phones, laptops, and PDAs).Resource pooling. Multi-tenant model.. There is a sense of location independence in that the customer generally has no control or knowledge over the exact location of the provided resources but may be able to specify location at a higher level of abstraction (e.g., country, state, or datacenter). Examples of resources include storage, processing, memory, network bandwidth, and virtual machines.Rapid elasticity. Capabilities can be rapidly and elastically provisioned, in some cases automatically, to quickly scale out and rapidly released to quickly scale in. To the consumer, the capabilities available for provisioning often appear to be unlimited and can be purchased in any quantity at any time.Measured Service. Cloud systems automatically control and optimize resource use by leveraging a metering capability at some level of abstraction appropriate to the type of service (e.g., storage, processing, bandwidth, and active user accounts).
Cloud computing by shashank
CLOUD COMPUTING –
BY SHASHANK SHEKHAR
B.Tech II year
E-mail id- firstname.lastname@example.org
Cloud Computing is a type of internet based computing where
different services such as servers, storage and application are
delivered to an organisation’s computer or devices through internet.
Cloud Computing is document centric - documents are not stored in
ones individual computer but on a server which can be accessed by
any one via internet.
Examples of cloud computing includes:• Online file storage
• Social networking sites
Webmail and online business app
Low Cost Software
On Demand Self-Service
Broad Network Access
CLOUD SERVICE MODELS
Software as a
Platform as a
a Service (IaaS)
SOFTWARE AS A SERVICE (SAAS)
In the Saas model, the cloud providers install and operate
application software in the cloud and cloud user access the
software from the cloud clients. The user does not need to
install and run the application so it simplifies maintenance and
In Saas the user are not required to handle software upgrades
and patches. Software is delivered in a one to many models.
With Saas it is easy for enterprises to streamline their
maintenance and support because everything is managed by
Examples of SaaS include SalesForce.com, Google Mail,
Google Docs, and so forth
PLATFORM AS A SERVICE (PAAS )
It offers runtime environment or platform to create and deploy.
The organisation is responsible for development, management
and maintenance of the application.
It makes the development, testing and deployment of application
quick, simple and cost effective.
The drawback of this model is that it lacks interoperateability and
portability among providers. If we create an app in one cloud we
cannot move it into another cloud we need to pay a higher price
Eg. Windows azure, Google app engine, mendix, engine guard,
INFRASTRUCTURE AS A SERVICE (IAAS
It is the most basic cloud- service model, provides computer
physical or virtual machines and other resources.
It offers additional resources such as a virtual machine diskimage library, raw and file based storage, fireworks, IP addresses,
VLANs and software bundles.
Eg. Amazon EC2, azure services, Google computer engines, HP
It makes the acquisition of hardware’s easier. Rather than
purchasing the server, storage, OS it can be accessed through
TYPES OF CLOUD
There are many issues to consider when moving an enterprise
application to the cloud environment. For example, some service
providers are mostly interested in lowering operation cost, while others
may prefer high reliability and security.
Accordingly, there are different types of clouds, each with its own
benefits and drawbacks:• Public clouds
• Private clouds
• Hybrid clouds
TYPES OF CLOUD
PUBLIC CLOUD –
A cloud in which service providers offer their resources as
services to the general public.
Public clouds offer several key benefits to service providers,
including no initial capital investment on infrastructure and
shifting of risks to infrastructure providers.
public clouds lack fine-grained control over data, network and
security settings, due to which their effectiveness is
PRIVATE CLOUD –
Also known as internal clouds, private clouds are designed
for exclusive use by a single organization.
TYPES OF CLOUD CONT..•
A private cloud offers the highest degree of control over
performance, reliability and security.
HYBRID CLOUD –
A hybrid cloud is a combination of public and private cloud
models that tries to address the limitations of each approach.
In a hybrid cloud, part of the service infrastructure runs in private
clouds while the remaining part runs in public clouds.
Hybrid clouds offer more tighter control, flexibility and security
than both public and private clouds.
Designing a hybrid cloud requires carefully determining the best
split between public and private cloud components.
Lower-Cost Computers for Users •
Since applications run in the cloud, not on the desktop PC, so
desktop PC does no need the processing power or hard disk space
demanded by traditional desktop software.
Lower Software Costs –
Instead of purchasing expensive software applications, we can get
most of what we need for free.
Instant Software Updates –
• Another advantage to cloud computing is that you are
no longer faced with choosing between obsolete
software and high upgrade costs.
• When the application is web-based, updates happen automatically
Unlimited Storage Capacity –
• Cloud computing offers virtually limitless storage of nearly
hundreds of Pbytes.
Increased Data Reliability
• It is data centric so even if our PC crashes, all your data is still
out there in the cloud, still accessible
Universal Access to Documents • That is not a problem with cloud computing, because you do
not take your documents with you.
Instead, they stay in the cloud, and you can access them
whenever you have a computer and an Internet connection
Latest Version Availability
The cloud always hosts the latest version of our documents, it
will automatically update it without users knowledge.
Computers in a cloud computing system boot and run faster
because they have fewer programs and processes loaded into
Easier group collaboration:
Sharing documents leads directly to better collaboration.
Many users do this as it is an important advantages of cloud
Device independence we are no longer tethered to a single computer or network.
Even on moving to a portable device,our applications and
documents are still available.
Improved document format compatibility.
You do not have to worry about the documents you create on your
machine being compatible with other users' applications or OS.
There are potentially no format incompatibilities when everyone is
sharing documents and applications in the cloud.
Requires a constant Internet connection•
Does not work well with low-speed connections:
Cloud computing is impossible if there is no Internet
A dead Internet connection means no work and in areas
where Internet connections are few or inherently unreliable,
this could be a deal-breaker.
Web-based applications require a lot of bandwidth to
download, as do large documents.
Each cloud systems uses different protocols and different
may not be possible to run applications between
different cloud based systems.
Features might be limited:
This situation is bound to change, but today many web-based
applications simply are not as full-featured as their desktop-based
For example, we can do a lot more with Microsoft PowerPoint
than with Google Presentation's web-based offering.
Stored data might not be secure:
With cloud computing, all your data is stored on the cloud but
unauthorized users can gain access to our confidential data.
Stored data can be lost:
Theoretically, data stored in the cloud is safe, replicated
across multiple machines.
Automated service provisioning
Virtual machine migration
Traffic management and analysis
Cloud computing has recently emerged as a compelling
paradigm for managing and delivering services over the
The rise of cloud computing is rapidly changing the
landscape of information technology, and ultimately turning
the long-held promise of utility computing into a reality.
However, despite the significant benefits offered by cloud
computing, the current technologies are not matured
enough to realize its full potential.
Armbrust M et al (2009) Above the clouds: a Berkeley view
of cloud computing. UC Berkeley Technical Report
NIST Definition of cloud computing
Windows Azure, www.microsoft.com/azure