Engineering rules for provisioning nodes and servers

This topic describes recommendations and rules for provisioning nodes and system servers.

Configuration rules

There can be a maximum of two load balancers in the system

The original of any database segment, Lucent CM application, or load balancer cannot be deleted.

The Peer Node pull down list contains only nodes that have a database assigned and have no peers.

It is recommended the database is grown in pairs (for example, two nodes at a time) after the second node is added to the system. Only those database nodes that have peers run in a high availability configuration. Failure to assign a peer for the database means there is no fail over when the database node goes down.

The Node Name cannot be updated after a node is added. External Hostname and Internal Hostname cannot be changed using the Lucent CM Explorer, but can be changed using a script.

Mixing hardware platforms

The hardware platforms that are supported by Lucent CM can be mixed in all Lucent CM configurations. Mixing hardware platforms impacts performance and capacity because the performance and capacity of the platforms differ.

It is recommended to use the same hardware platform type for both D-nodes of a data segment.

Segments

The Lucent CM system supports multiple databases. The databases are grouped in segments. Databases in a segment can be configured as replicated or as non-replicated.

Segmenting allows you to distribute user information across multiple nodes. The first segment stores information on the system, groups, and partitions.

Peer nodes and high availability

To provide High Availability (HA), databases are configured with a Peer Node. In a high availability configuration, information is replicated between a pair of databases.

Remove node

An administrator cannot remove the Lucent CM application node to which the administrator is connected. To remove a Lucent CM application node, the system administrator must connect to a different node than the one that must be removed.

Call servers

A Lucent CM system can connect to multiple call servers. However a call server must be managed by a single Lucent CM system. This ensures configuration data from a Lucent CM is not overwritten by another Lucent CM that is also connected to the call server.