Characteristics of IaaS, PaaS and SaaS
IaaS Characteristics
- Scale
- Converged network and IT capacity pool
- Self-service and on-demand capacity
- High reliability and resilience
IaaS key Benefits
- Usage is metered and price on the basis of units (or instances) consumed
- The ability to scale up and down of infrastructure service based on actual usage.
- Reduced cost of ownership
- Reduced energy and cooling costs.
PaaS Key Characteristics
- Support multiple languages and frameworks
- Multiple hosted environments
- Flexibility
- Allow choice and reduce “lock-in”
- Ability to “Auto-scale”
PaaS Key Benefits
- The operating system can be changed and upgraded frequently including associated features and systems services
- Globally distributed development teams are able to work together on software development projects within the same environment
- Service is available and can be obtained from diverse sources that cross international boundaries.
- Upfront and recurring or ongoing costs can be significantly reduced.
Software as a Service (SaaS)
SaaS
- SaaS is a distributed model where the software application is hosted by a vendor or cloud service provider and made available to customers over network resources
- Two delivery models:
- “Hosted Application Management” (hosted AM)
- “Software on Demand”
Application
- Clients are able to access their application and data from anywhere at any time
- Overall reduction of costs
- Application and Software Licensing
- Reduced Support Costs
- Back End Systems and Capabilities
SaaS Benefits
- Ease of use and limited/minimal administration
- Automatic updates and patch management
- Standardization and compatibility
- Global accessibility
