Quiesce servers or services for maintenance windows
To remove a server or service from the Load Balancer configuration for any reason (updates, upgrades, service, etc.), you can use the dscontrol(or cbrcontrol) manager quiesce command. You cannot use quiesce in the Site Selector component.
About this task
The quiesce subcommand allows existing connections to
complete without being severed and disallows any new connections to
a server or service. You can quiesce servers on a scheduled time to
perform upgrades or general maintenance. The daily option specifies
to quiesce the server at a time that you specify.
New feature:

When you want to bring down a particular service
on a server, like HTTP, you can now quiesce individual daemons. If
you have added server1 to port 80 and port 22 of a cluster, for example,
the usual quiesce command will stop forwarding traffic to server1
on port 80 and port 22. This new option allows you to stop traffic
only on port 80 if you need to stop that particular service.newfeat
Tip: You can use similar steps for quiescing the server for
the CBR component.