2. SaaS (Software as a Service)
Allowing
users to access specific
applications on-line
Advantage
Charge on a subscriptions basis
Disadvantage
Generic applications may not work
3. PaaS (Platform as a Service)
Provide environment to allow for users to create their own
web applications
Azure – Microsoft
App Engine – Google
Force.com – SalesForce
Pros
Build and Run one application for Free
RAD (rapid application development)
Private or public deployment
Cons
Build and Run one application for Free
Limits developers to tools provided by the PaaS developer
Risk of Vendor lock in
4. Iaas (Infrastructure as a
Service)
Allow business to run whatever applications
that the business has to a cloud supplier’s
hardware
Migrate applications to the suppliers
hardware
Physical or virtual servers
Virtualization – allow for suppliers to share
physical servers
Pros
Lower IT costs
5. IaaS Types
Private Cloud
Dedicated Hosting
Customer rents physical servers on demand
Cost and numbers of servers matching their demand
Hybrid Hosting
Most secure and costly
Mix of physical and virtual servers are hosted on
demand of the customer to reduce costs and increase
flexibility
Cloud Hosting
Customer rents virtual servers on demand and often on
an hourly basis
6. IaaS Vendors
Amazon
Web Services
Offers many options
Preconfigured software from
Oracle, IBM, etc
Rackspace
Private cloud to Cloud Hosting
GoGrid
Cloud hosting, Hybrid hosting, Dedicated
hosting