Taking service groups offline works from the top down, as opposed to the online operation, which works from the bottom up. The time it takes to offline a service group depends on the number of resources in the service group and the time to offline the group's resources. For example, if service group G1 has three resources, R1, R2, and R3 where R1 depends on R2 and R2 depends on R3, VCS first offlines R1. When R1 is offline, VCS offlines R2. When R2 is offline, VCS offlines R3. The time it takes to offline G1 equals the time it takes for all resources to go offline.