All entries for Tuesday 31 March 2015
March 31, 2015
Writing about web page http://erpcloudnews.com/2010/05/different-types-of-cloud-erp/
Cloud Infrastructure and it’s impact on Hosting and SaaS
Cloud technology enables SaaS and powerful new forms of hosting that can reduce the cost of service delivery. Note that cloud does not equal SaaS and cloud is not mutually exclusive from hosting.
How much cloud do you need?
Customers can purchase services with different amounts of “cloud” in the service delivery stack. Assume that we have four distinct layers of delivery: cloud infrastructure (hardware resources for the cloud), cloud platform (operating system resources for the cloud), cloud applications (application resources built for the cloud), and client resources (user interface to the cloud). This distinction helps us illustrate the way cloud services are offered in the diagram below.
In this simplified diagram, we show three types of cloud services:
- Cloud Infrastructure (for example: Amazon, GoGrid) delivers an cloud infrastructure where you install and maintain a platform and an application.
- Cloud Platform (for example: Windows Azure) delivers a cloud platform where you install and maintain your applications without worrying about the operating environment.
- Cloud Application (for example: Salesforce.com) delivers a complete application, all you maintain is your client access program which is frequently a browser.
SaaS ERP and Cloud Models
Even legacy ERP vendors are moving to cloud technologies to offer software as a service to their customers. When vendors offer SaaS, the customer is only responsible for maintaining their client device (usually just a browser).
Vendors can offer SaaS utilizing all three cloud infrastructures above. Some vendors such as Acumatica offer all three types of services.
- Offering SaaS using a cloud application is straightforward. In this case the vendor builds an application which is tightly integrated with infrastructure and hardware so that the three components cannot be separated.
- Offering SaaS using a cloud platform means that the vendor must manage the application layer separately from the platform layer. This architecture gives the vendor the flexibility to move the application to a separate cloud platform provider.
- Offering SaaS using a cloud infrastructure is similar to a managed hosting scenario. In this case the vendor installs and manages both an operating system and their application on top of a multi-tenant hardware infrastructure. This technique provides maximum flexibility, but may increase overhead slightly.
Comparing SaaS Offering Options
|SaaS using a Cloud Application
||Maximizes efficiencies for “cookie cutter” applications||Vendor lock-in, customer does not have option to move application to a different provider|
|SaaS using a Cloud Platform
||Mix of flexibility and savings||Coordination challenges – vendor manages the application while a service provider manages infrastructure|
|SaaS using a Cloud Infrastructure
||Maximizes flexibility to switch providers or move on-premise||Some would argue this is nothing more than a hosted service with a slightly lower pricing structure|
Multi-tenant applications can be deployed in any scenario to reduce overhead associated with upgrading multiple customers and maintaining different versions of software. This implies that multi-tenancy reduces the flexibility to run an old version of software and limits customization and integration potential. Multi-tenant options should be priced lower to offset the loss of flexibility.