Novell EDIRECTORY 8.8 SP3, Administration Manual, Page: 554 / 634

554 Novell eDirectory 8.8 Administration Guide
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Figure 18-3
Cascading Server Effect
In addition, ARC is a good choice for improving fault tolerance. It has the ability to easily identify
server communication problems.
18.4.2 Advantages of Referral Costing
Š
It times/routes most Resolve Name requests to remote servers as they are made.
Š
It averages the Resolve Name request times in milliseconds on each address. This allows ARC
to be more granular and adjust the cost of the referral more aggressively. It is also able to
quickly detect a slow server, because timing is tracked in milliseconds instead of seconds.
Š
It tracks outstanding requests so quickly determine if a request is taking too long. It does not
have to wait for the request to complete in order to know that the server is taking a long time.
Š It tracks response time on a per-address basis. It is normal for a server to have numerous
connections to the same address. By tracking per address instead of per connection, one
connection can benefit from statistics gathered from the other connections.
NOTE: To account for LDAP requests, ARC also takes into account responsiveness of private
connections.