MSDN – Multi-Tenancy Support in Sharepoint 2010

http://blogs.technet.com/b/speschka/archive/2009/11/30/enabling-multi-tenant-support-in-sharepoint-2010.aspx

A new feature to support hosting environment. By default, the multi-tenant infrastructure is not turned on; it requires a custom service application
to be provisioned.

Features:
1. Multi-tenant admin site: give you a central location where all the sites for a particular tenant can be managed. View all the site collections in the tenancy. Create new site collection, manage site collection administrators.
2. Multi-tenant member site:
3. Feature packs:

Example:
* Tenant “customer 1” on site collection 1 is hosted on Web Application A
* Tenant “customer 2” on site collection 3 is hosted on Web Application A

Each tenant would only have full administrator right on their own assigned site collection. Customer 1 won’t be able to access Customer 2’s site collection.

Also, service application in hosting mode would also keep each tenant’s data apart.

Site Groups

** The segregation is possible through the use of site groups, also known as site subscription.

Features:
1. Site can only be in on site group.
2. Sites cannot join in a site group that contains sites exists on a different web application (that is, must be in the same web application to join the same group)
3. A site group can span across more than one content database.
4. No GUI interface for managing site groups. Use Powershell.

Tenant Admin Site

A hosted customer is referred to as Tenant. The tenant admin site can be used to create additional sites after self-service site creation is enabled.

Service Application and Hosting —

By default, a service application is consumed at the web application level. SO all sites, under a web application would consume from the same service application and data would be shared. In hosting mode, a shared service application partition data where each site group has its own partition.

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