There are multiple scenarios where it is desired that a data center is made non-operational, and the users are migrated over to the other data center. Scenarios include occurrence of some disastrous event which leaves a data center completely or partially non-functional, in-service upgrades or even a routine maintenance procedure. In any of these scenarios, administrators must ensure that the access to the data center undergoing maintenance is completely disabled. For more information, see Disabling access to a data center.

Conversely, while recovering a failed data center or making a data center functional after maintenance, administrators must ensure that all the components are recovered and ready to provide service before the users are allowed access to the data center. For more information, see Enabling access to a data center.