Target Skill:
List the BillerXpert components and identify the function of each |
|
NAS Load Balancing
A NAS server cluster provides load balancing, which is required for a scalable
EBPP system. In a NAS cluster, processing load is distributed efficiently
among many web servers, application servers, and information sources. With
its distributed synchronization facility, a NAS cluster also eliminates
a single point of failure and supports the EBPP requirement for reliable,
fault-tolerant operation. The following illustration shows how NAS
load balancing works with a cluster containing 3 servers.

-
The web server relays a request to NAS1
-
NAS1 determines that NAS3 is the most available and sends a message informing
the web server.
-
The web server updates its NAS load table and sends the request to NAS3
-
NAS3 performs the required process, interfacing to datasource or external
information sources, as necessary, and returns the result directly to the
web server.
-
Future requests from the web server go directly to NAS3 based on priorities
& server load.
The NAS Distributed Synchronization Facility provides the infrastructure
for distributed applications and enables distributed state/session management
across servers. State information can be accessed symmetrically from all
servers. This eliminates a single-point of failure and helps guarantee
reliable access to data stores and other information sources.
|