Improving Server-To-Server Connection - Novell EDIRECTORY 8.8 SP2 - ADMINISTRATION Manual

The following sections provide information about how you can improve the performance of
eDirectory servers:

18.4.1 Improving Server-to-Server Connection

Advanced Referral Costing (ARC) is an improved costing algorithm that is disabled by default. It is
available in eDirectory 8.7.3.9 and eDirectory 8.8.2. The main purpose of ARC is to prevent server
outages. Some of the benefits of ARC can include:
Who Should Use ARC?
Servers that don't hold a local copy of an object or service need to walk the tree for information
benefit from ARC, because they frequently communicate with the other servers. ARC is very
effective in an LDAP environment, especially during prefer chaining.
For example, a server is sometimes overwhelmed by other servers that always make requests to that
server, as illustrated in
540 Novell eDirectory 8.8 Administration Guide
Section 18.4.1, "Improving Server-to-Server Connection," on page 540
Section 18.4.2, "Advantages of Referral Costing," on page 542
Section 18.4.3, "Deploying ARC," on page 543
Section 18.4.4, "Enabling Advanced Referral Costing," on page 544
Section 18.4.5, "Tuning Advanced Referral Costing," on page 544
Section 18.4.6, "Monitoring Advanced Referral Costing," on page 545
Improved server performance and fault tolerance
Better server-to-server communications
Load distribution
Remote server health monitoring
Simplified isolation and identification of communication problems
Figure 18-2.