Load Balancing Property

In Directory Proxy Server 5.2, the ids-proxy-sch-LoadBalanceProperty is used to configure load balancing across multiple LDAP servers. Directory Proxy Server 5.2 supports proportional load balancing only, that is, each LDAP server is allotted a certain percentage of the total load. The ids-proxy-sch-LoadBalanceProperty object class has one attribute, ids-proxy-con-Server, whose value has the following syntax:

server-name[#percentage]

In Directory Proxy Server 5.2, these configuration attributes are stored under ids-proxy-con-name=load-balancing-1,ou=properties,cn=user-defined-name,ou=dar-config,o=NetscapeRoot.

In Directory Proxy Server 11g Release 1 (11.1.1), load balancing is configured as a property of a data source pool. A data source pool is essentially a collection of LDAP servers to which Directory Proxy Server can route requests. For information about setting up a data source pool, see Creating and Configuring LDAP Data Source Pools in Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition. For a list of properties associated with a data source pool, run the following command:

$ dpconf help-properties | grep ldap-data-source-pool

Directory Proxy Server 11g Release 1 (11.1.1) supports proportional load balancing but also supports additional load balancing algorithms. To configure proportional load balancing, set the property of the data source pool as follows:

$ dpconf set-ldap-data-source-pool-prop data-source-pool-name \
  load-balancing-algorithm:proportional

The percentage of load allotted to each server is configured by setting various properties of an attached data source. An attached data source is a data source that has been attached to a specific data source pool. To configure proportional load, set the weight properties of the attached data source for each operation type as follows:

$ dpconf set-attached-ldap-data-source-prop data-source-pool-name attached-data-source-name
 add-weight:value
 bind-weight:value
 compare-weight:value
 delete-weight:value
 modify-dn-weight:value
 modify-weight:value
 search-weight:value

For more information, see Configuring Load Balancing in Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition.

Monitoring Backend Servers

To monitor the state of its backend LDAP servers, Directory Proxy Server 5.2 performs an anonymous search operation on the Root DSE of each server every ten seconds. Directory Proxy Server 11g Release 1 (11.1.1) has a number of properties that can be configured to monitor its backend servers. For more information, see Retrieving Monitored Data About Data Sources in Oracle Fusion Middleware Administration Guide for Oracle Directory Server Enterprise Edition.