Cluster

Use these pages to view information about the servers in a high-availability cluster and the service level agreements associated with the cluster.

Prerequisite: For the Connection Manager, the OpenAdmin Tool (OAT) for Informix® requires IBM® Informix 11.70.xC3 and the Connection Manager that is packaged with Informix 11.70.xC3 or later, or with IBM Informix Client Software Development Kit (Client SDK) 3.70.xC3 or later.

A cluster is one type of connection unit that is managed by a Connection Manager. A Connection Manager provides load balancing and directs client connection requests to the appropriate server in a connection unit based on service level agreements (SLA).

Cluster Topology

Use this page to view the topology of the selected cluster. The topology shows the relationships between the servers in the cluster: the primary server, the high-availability data replication (HDR) server, the shared disk secondary (SDS) servers, and the remote standalone secondary (RSS) servers.

Server List

Use this page to view information about servers in the connection unit.

Updates Enabled: An indicator of whether updates are enabled for a secondary server in the cluster. When updates are enabled, applications connected to this secondary server can modify database data. Insert, update, and delete operations performed on this secondary server are propagated to the primary server. When updates are not enabled, the secondary server is read-only. Applications connected to this secondary server cannot modify database data.

SLA

Use this page to view information about the service level agreements (SLAs).

SLA

The name of the SLA. An SLA is the contract between specified client applications and their service providers, in this case, the Informix database servers. Based on service level agreements, the Connection Manager connects the client applications to the appropriate servers.

Servers

The servers and server types in the SLA listed in order of connection preference with the first server listed having the highest connection priority. For example, the list SDS,HDR,RSS,primary indicates that the client is connected first to a shared disk secondary server (SDS). If no SD secondary servers are available, the client is connected to the high-availability data replication (HDR) server. If the HDR server is not available, the client is connected to a remote standalone secondary (RSS) server. If no RS secondary servers are available, the client is connected to the primary server. When a group of servers is in parenthesis, all the servers have the same connection priority. For example, the following list gives each server equal priority: (g_one,g_two,g_three).

Service Port

The port number associated with the SLA.

Mode

The mode that the Connection Manager uses to redirect client requests.

Redirect: The Connection Manager redirects client connection requests to the appropriate server. The Connection Manager returns the appropriate server node, IP address, and port number to the client application (depending on the SLA definition). The client application connects to the server using the IP address and port number that the Connection Manager provides.
Proxy: The Connection Manager functions as a proxy server when clients connect to database servers from outside a firewall. The Connection Manager actively routes all client communications to and from the database servers.