To create a server cluster, select the Create option from the context-sensitive menu in the Server clusters tab in the Client configuration dialog box.
To modify a server cluster, you must either:
- Select the Modify option from the context-sensitive menu in the Server clusters tab in the Client configuration dialog box.
The cursor must be positioned over a server cluster name.
- Double-click a server cluster name.
Data entry
Name
Alias of the machine corresponding to the server cluster.
Description
Remark associated with the server cluster.
Profile
Server cluster connection profile.
Password
Password for the connection profile.
Balancing algorithm
Selects the load balancing algorithm that the load balancer will use when determining which physical server to use.
The following methods are supported:
Round Robin |
The load balancer distributes connections sequentially to the various servers in the cluster. |
By number of connections |
The load balancer selects the server that is currently handling the fewest connections. |
Lists
This list shows the servers selected in the cluster. Only standard servers can be assigned to a cluster. HTTP physical servers and physical servers that operate "via HTTP" are not permitted in cluster configurations.
The list shows the following details for each server:
- The name of the selected physical server,
- The group to which the server belongs (main or backup),
- The server's relative weight in the server cluster.
(For example, if the main group contains two servers (SRV1 with a weight of 3 and SRV2 with a weight of 2), the load balancer will tend to select server SRV1 3 times out of 5, and server SRV2 2 times out of 5).
You can edit any of the details by clicking on the corresponding cell. An input field or combo box is displayed.
To add a physical server, click on the Physical Server cell in the blank row at the bottom of the list.
Context-sensitive menu
A context-sensitive menu associated with the server list lets you perform the following actions:
Add
This option displays a dialog box that lets you enter the name, group and weight of the server that you want to add to a server group.
Modify
This option displays a dialog box that lets you modify the name, group and weight of the server that belongs to a server group.
Delete
Removes the selected server from the server cluster list.
A cluster is considered to be valid when at least one server has been defined in the main group.
It goes without saying that the servers must have compatible configurations (i.e. the same users/passwords and the same databases). Similarly, all the servers should ideally be the same type (C / Java / AS400), although this is not essential.
Buttons
Create/Modify
This button validates the information entered and closes the dialog box.
Cancel
This button closes the dialog box without validating the information entered.