About the First Fit policy
The First Fit policy always chooses the first available resource that satisfies all the service-specific quota requirements.
The order of the resources depends upon the following:
Whether the resource is dedicated or shared by the administrator creating the organization. For example, if a reseller has one dedicated and one shared resource, the dedicated resource takes the first preference.
The resource's identifier (ID) stored in the Unify database. This ID identifies the order in which resources are added to the setup using the Unify control panel. For example, if a reseller has two dedicated resources, the resource that was added first (lower resource ID) among the two takes the first preference.
Example: A reseller has two dedicated resources with resource IDs as 10 and 11. It can also use two shared resources of the service provider that have the IDs as 1 and 2 for provisioning a service to an organization. Thus, the reseller now has four resources (10, 11, 1, and 2) available with it. If the reseller now tries to provision a service to an organization, and all the four resources satisfy all the service-specific quota requirements, the First Fit policy will choose the resource with ID as 10 for provisioning the service for this organization.