Novell BUSINESS CONTINUITY CLUSTERING 1.2.1 - ADMINISTRATION, Руководство администратора

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72 BCC 1.2.1: Administration Guide for OES 2 SP2 Linux
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The BCC drivers are installed and configured on the Identity Manager node in each of the peer
clusters in the business continuity cluster. Each of the driver connections has a Publisher channel
(sending) and a Subscriber channel (listening) for sharing information between any two peer
clusters. The two nodes are not directly connected; they communicate individually with the Identity
Manager vault on a port that is assigned for that instance of the driver.
You must assign a unique port for communications between any two peer clusters and between any
two trees. The default port in the Cluster Resource Synchronization template is 2002. The default
port in the User Object Synchronization template is 2001. You can use any ports that are unique for
each instance of a driver, and that are not otherwise allocated. Make sure the ports are not blocked
by the firewall. Examples of port assignments are shown in the tables below.
You must specify the same port number for the same driver instance on both cluster nodes. For
example, if you specify 2003 as the port number for the Cluster Resource Synchronization driver on
one cluster, you must specify 2003 as the port number for the same Cluster Resource
Synchronization driver instance on the peer cluster.
For example, let’s consider a two-cluster business continuity cluster. The Cluster Resource
Synchronization driver’s Publisher channel in Cluster One communicates with the driver’s
Subscriber channel in Cluster Two. Conversely, the driver’s Publisher channel in Cluster Two
communicates with the driver’s Subscriber channel in Cluster One. The two clusters send and listen
to each other on the same port via the Identity Manager vault, as shown in
Table 9-1 .
Table 9-1
Single-Tree Two-Cluster Driver Set Example
You install the Cluster Resource Synchronization driver once on Cluster One and once on Cluster
Two, as shown in
Table 9-2 .
Table 9-2
Driver Set Summary for a Single-Tree, Two-Cluster Business Continuity Cluster
Cluster Resource Subscriber Node
Publisher Node Cluster One Cluster Two
Cluster One Not applicable CR, port 2002
Cluster Two CR, port 2002 Not applicable
Driver Instance Driver Set for Cluster One Driver Set for Cluster Two
Cluster Resource C1 to C2, port 2002 C2 to C1, port 2002