Cloud Computing part 5

5 Public Cloud Model

5.1 Public Cloud

The Public Cloud allows systems and services to be easily accessible to general public, e.g., Google, Amazon, Microsoft offers cloud services via Internet.

5.2 Benefits

There are many benefits of deploying cloud as public cloud model. The following diagram shows some of those benefits:

Benefits

COST EFFECTIVE

Since public cloud share same resources with large number of consumer, it has low cost.

RELIABILITY

Since public cloud employs large number of resources from different locations, if any of the resource fail, public cloud can employ another one.

FLEXIBILITY

It is also very easy to integrate public cloud with private cloud, hence gives consumers a flexible approach.

LOCATION INDEPENDENCE

Since, public cloud services are delivered through Internet, therefore ensures location independence.

UTILITY STYLE COSTING

Public cloud is also based on pay-per-use model and resources are accessible whenever consumer needs it.

HIGH SCALABILITY

Cloud resources are made available on demand from a pool of resources, i.e., they can be scaled up or down according the requirement.

Disadvantages

Here are the disadvantages of public cloud model:

LOW SECURITY

In public cloud model, data is hosted off-site and resources are shared publicly, therefore does not ensure higher level of security.

LESS CUSTOMIZABLE

It is comparatively less customizable than private cloud.

6 Private Cloud Model

6.1 Private Cloud

The Private Cloud allows systems and services to be accessible with in an organization. The Private Cloud is operated only within a single organization. However, It may be managed internally or by third-party.

 

6.2 Benefits

There are many benefits of deploying cloud as private cloud model. The following diagram shows some of those benefits:

HIGHER SECURITY AND PRIVACY

Private cloud operations are not available to general public and resources are shared from distinct pool of resources, therefore, ensures high security and privacy.

MORE CONTROL

Private clouds have more control on its resources and hardware than public cloud because it is accessed only within an organization.

COST AND ENERGY EFFICIENCY

Private cloud resources are not as cost effective as public clouds but they offer more efficiency than public cloud.

Disadvantages

Here are the disadvantages of using private cloud model:

RESTRICTED AREA

Private cloud is only accessible locally and is very difficult to deploy globally.

INFLEXIBLE PRICING

In order to fulfill demand, purchasing new hardware is very costly.

LIMITED SCALABILITY

Private cloud can be scaled only within capacity of internal hosted resources.

7 Hybrid Cloud Model

7.1 Hybrid Cloud

The Hybrid Cloud is a mixture of public and private cloud. Non-critical activities are performed using public cloud while the critical activities are performed using private cloud.

7.2 Benefits

There are many benefits of deploying cloud as hybrid cloud model. The following diagram shows some of those benefits:

SCALABILITY

It offers both features of public cloud scalability and private cloud scalability.

FLEXIBILITY

It offers both secure resources and scalable public resources.

COST EFFICIENCIES

Public cloud are more cost effective than private, therefore hybrid cloud can have this saving.

SECURITY

Private cloud in hybrid cloud ensures higher degree of security.

Disadvantages

NETWORKING ISSUES

Networking becomes complex due to presence of private and public cloud.

SECURITY COMPLIANCE

It is necessary to ensure that cloud services are compliant with organization's security policies.

INFRASTRUCTURAL DEPENDENCY

The hybrid cloud model is dependent on internal IT infrastructure, therefore it is necessary to ensure redundancy across data centre. 

8. Community Cloud Model

8.1 Community Cloud

The Community Cloud allows system and services to be accessible by group of organizations. It shares the infrastructure between several organizations from a specific community. It may be managed internally or by the third-party.

8.2 Benefits

There are many benefits of deploying cloud as community cloud model. The following diagram shows some of those benefits:

COST EFFECTIVE

Community cloud offers same advantage as that of private cloud at low cost.

Sharing Between Organizations

Community cloud provides an infrastructure to share cloud resources and capabilities among several organizations.

SECURITY

Community cloud is comparatively more secure than the public cloud.

ISSUES

• Since all data is housed at one location, one must be careful in storing data in community cloud because it might be accessible by others.
• It is also challenging to allocate responsibilities of governance, security and cost.