Multitenancy

Multitenancy 1 Multitenancy contrasts with multi-instance architectures where separate software instances (or hardware systems) operate on behalf of different client organizations

Multitenancy 1 Commentators regard multitenancy as an important feature of cloud computing.

Multitenancy - Differentiation from virtualization 1 In a multitenancy environment, multiple customers share the same application, running on the same Operating System, on the same hardware, with the same data- storage mechanism. The distinction between the customers is achieved during application design, thus customers do not share or see each other's data. Compare this with virtualization where components are abstracted enabling each customer application to appear to run on a separate virtual machine.

Multitenancy - Competitive differentiation 1 Some companies actively promote the principle of multitenancy and use it as a source of competitive differentiation.

Multitenancy - Cost savings 1 Multitenancy reduces this overhead by amortizing it over many customers

Multitenancy - Data aggregation/data mining 1 This reason is probably overhyped as one of the core multitenancy requirements is the need to prevent Service Provider access to customer (tenant) information

Multitenancy - Release management 1 Multitenancy simplifies the release management process. In a traditional release management process, packages containing code and database changes are distributed to client desktop and/or server machines. These packages then have to be installed on each individual machine. With the multitenant model, the package typically only needs to be installed on a single server. This greatly simplifies the release management process.

Multitenancy - Release management 1 At the same time, multitenancy increases the risk of applying a new release version and the effects of that

Multitenancy - Virtualization 1 The costs of redesigning applications for multitenancy can be significant, especially for software vendors who continue to offer an on-premise single tenant version of their product. They end up being forced to support 2 distinct products with all the resulting costs.

Multitenancy - Virtualization 1 An increasingly viable alternative route to multitenancy that eliminates the need for significant architectural change is to use virtualization technology to host multiple isolated instances of an application on one or more servers. Indeed, when applications are repackaged as virtual appliances the same appliance image can be deployed in ISV hosted, on-premise or trusted-third party locations and even migrated from one deployment site to another over time.

Multitenancy - Notes 1 Jump up ^ The silly debate over multitenancy

Multitenancy - Further reading 1 Google App Engine Multitenancy Support for Java and Python.

Multitenancy - Further reading 1 Athena Framework Java ORM with native support for multitenancy.

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