Red Hat DIRECTORY SERVER 8.0, Administration Manual

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Chapter 8. Managing Replication
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The two attributes are designed so that the
nsds5ReplicaSessionPauseTime
interval will always
be at least one second longer than the interval specified for
nsds5ReplicaBusyWaitTime
. The
longer interval gives waiting suppliers a better chance to gain consumer access before the previous
supplier can re-access the consumer.
• If either attribute is specified but not both,
nsds5ReplicaSessionPauseTime
is set automatically
to 1 second more than
nsds5ReplicaBusyWaitTime
.
• If both attributes are specified, but
nsds5ReplicaSessionPauseTime
is less than or equal to
nsds5ReplicaBusyWaitTime
,
nsds5ReplicaSessionPauseTime
is set automatically to 1
second more than
nsds5ReplicaBusyWaitTime
.
If Directory Server has to automatically reset the value of
nsds5ReplicaSessionPauseTime
,
the value is changed internally only. The change is not visible to clients, and it not saved to the
configuration file. From an external viewpoint, the attribute value appears as originally set.
Replica busy errors are not logged by default because they are usually benign. To see the errors,
turn on the replication error logging, log level
8192
. The log levels are described in more detail in the
Directory Server Configuration, Command, and File Reference
.
8.6. Configuring Cascading Replication
This section provides information on setting up cascading replication. The steps described in this
section provide a high-level overview of the procedure, and cross-references to the detailed task
descriptions are provided at each step.
Setting up cascading replication, as shown in
Figure 8.4, “Cascading Replication”
, has three major
steps, for each server in the scenario, the supplier on Server A, which holds a read-write replica; the
consumer/supplier on hub Server B, which holds a read-only replica; and the consumer on Server C,
which holds a read-only replica:
•
Section 8.6.1, “Configuring the Read-Write Replica on the Supplier Server”
•
Section 8.6.2, “Configuring the Read-Only Replica on the Consumer Server”
•
Section 8.6.3, “Configuring the Read-Only Replica on the Hub”
•
Section 8.6.4, “Setting up the Replication Agreements”
8.6.1. Configuring the Read-Write Replica on the Supplier Server
Next, configure the supplier server, which holds the original copy of the database:
1. Specify the supplier settings for the server.
a. In the Directory Server Console, select the
Configuration
tab.
b. In the navigation tree, select the
Replication
folder.
c. In the right-hand side of the window, select the
Supplier Settings
tab.