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What is cloud Why is cloud computing typically cheaper?
computing?
You only pay for the services that you use and the resources that you consume in the cloud. As
the entire Azure customer base covers the cost of the servers in which your Azure resources will
be run on, the cost of running a solution is much lower than if you were to host this
independently. As such, the cloud helps to lower your operating expenses and run your
infrastructure more effectively.
The rental or PAYG model means that you can have access to extremely powerful systems with
the ability to scale up and down quickly as needed and to return the resource back to Azure
without hassle.
The delivery of services over the internet
using a pay-as-you-go (PAYG) pricing model.
In other words it's a way to rent computer Why should I consider moving to the cloud?
power and storage from someones elses
datacenter. However Azure offers a range of
services that can be categorised as The demand for better online experiences and software excellence has made the cloud service
compute, storage, databases, networking, provider market very lucrative. As such companies are looking for ways to deliver code faster
software, analytics and intelligence. The real and on larger scales. The benefits of the cloud computing have made these two requirements
power of the cloud is that you can deliver achievable at a great price point and is why companies choose to move to the cloud.
cutting edge services quicker, while allowing
Azure to handle your system maintenance. With the cloud, companies can cut down their release times from weeks/months down to days
in certain cases. This paired with better defined workflows and endless compute power is a
necessity for firms today.
, Shared Responsibility Model
Cloud Computing
Infrastructure as a Service (IaaS)
The model that gives the customer the
highest level of control and
self-management. This approach is useful
for lift and shift cloud projects and for
advanced data protection purposes.
However, it is typically the most costly.
Platform as a Service (PaaS)
The model where the customer only
controls the applications and its data. Eg.
A managed database - the customer
handles the tables/views/indexes etc and
the data and the CSP handles updates,
backups & patching.
Software as a Service (SaaS)
The model where you use existing cloud
applications and only worry about
software configuration issues. Eg.
Sharepoint file access.
, Cloud Models
Public Private Hybrid Multi
Delivered services over Delivered services over A model whereby private An increasingly common
the internet from a the internet, control by a and public clouds are used model is to use aspects of
provider who owns and single entity. Generally are are interconnected. multiple different cloud
manages a datacenter. hosted in an onsite They are often used for providers. Other common
You pay for what you datacenter or a dedicated extra security and use cases include
consume. The key offsite one. These provide compliance and to migrating from one cloud
difference between public high levels of control to account for overflow provider to another.
& private is multi-tenants. the organisation. compute.
, Cloud Models Comparison Chart
Cloud Models
The following table highlights the key differences between cloud models:
Public Private Hybrid
Cost Low (Costs budgeted as CapEx) High (Costs budgeted as OpEx) Medium - High (Complex
infrastructure)
Control Medium (Iaas, Paas & SaaS) High (Full Control) High (Full Control)
Compliance Medium (Reliance on the Provider) High (Full Compliance) High (Full Compliance)
Flexibility High (Managed by Cloud Provider) Low (Fully Self-managed) High (Full Flexibility)
Maintenance Low (Managed by Cloud Provider) High (Managed by Consumer) Medium (Shared Management)
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