Roller Deployment

Blog portlet creates Roller weblogs and users in a flat space. Such weblog server resources are not name-spaced by the Portal ID or any other identifier. The desired deployment is therefore one Roller server instance per portal

You can use a single Roller server instance for multiple portals.

In this situation, users in Portal A and B will not be allowed to have like-named weblogs. In a community context, users will not be able to have the community Blog service in like-named communities. This is because Blog portlet names the per-community weblog according to the community name.