Real Server Groups; Real Server Group Backup; Defining An Rsg - Avaya P330 User Manual

Chapter 6

Real Server Groups

RSGs are displayed in both the Logical and Physical Views. In the Logical
View, a graphical representation of the RSGs connected to the element
selected in the Tree or Table Area is displayed in the RSG Area. In the
Physical View, all RSGs and RSs are displayed in the Tree Area according
to the load balancing application.
In the Logical View, when you select an RSG from the RSG Area, a list of
the RSs connected to the RSG are displayed in the RS Area and the
RSG's Properties Sheet is displayed in the Form Area. If there are no RSs
connected to the RSG, no information is displayed in the RS Area.
In the Physical View, when you select an RSG from the Tree Area, the
RSG's Properties Sheet is displayed in the Form Area. The RSs that are
connected to the RSG are displayed in the tree.

Real Server Group Backup

You can configure a Real Server Group (RSG) to serve as a backup for a
primary RSG implementing a Virtual Service. You can configure an RSG
to backup one or more primary RSGs. An RSG can backup a primary
RSG, but not a backup RSG.
A backup RSG can run a different Virtual Service than the primary RSG
while supplying backup to all services of the primary RSG.
The backup RSG is not used for the primary RSG's services unless all the
Real Servers in the primary RSG are down. When backup is
implemented, the backup RSG runs the primary RSG's service in
addition to its own services.
When the primary RSG has recovered, it resumes operation. Ongoing
sessions continue going to the backup RSG until they are completed. In
addition, in order to maintain persistency, new sessions might open to
the backup RSG.

Defining an RSG

There are two ways to define a new RSG. You can define an RSG in
relation to other load balancing elements, or you can define an
unconnected RSG. Unconnected RSGs do not affect the current
configuration but are always available for use in configuring the
network. You may want to define unconnected RSGs if you want to add
all RSGs and RSs to the application before configuring the network.
63 Avaya P330 Load Balancing Manager User Guide