About resource limits

Resource limits define the server resources, such as disk space, required by a service.

Resource Limit	Description
Component Name	The name of the service component that requires resources.
Resource Type	A specific type of resource required by the service component. Resource types include bandwidth, number of mailboxes, or disk space.
Limit	The amount of server resources available to the resource type. You can allow unlimited resources by selecting the Unlimited option. If you want to allow unlimited resources, you can allocate more than the actual resources available on the server, as long as those resources are not all needed at once. This allows you to over-sell a server's resources. However, since no server's resources are actually unlimited, use this setting with discretion.
Sold	The amount of resource that has been sold by resellers but is not currently in use.
Usage	The percentage of the resource type in use. The usage percentage differs from the Sold percentage if resellers, sites, and users have not used all the resources sold to them.