Specifications

14 – Configuring and Monitoring a Redundant Server System
304 R400
However, the naming (or at least alias) scheme given to these nodes is important
for servers (for example: hsserva, hsservb, hsserva0, hsserva1, hsservb0,
hsservb1). This naming convention enables each redundant server to find the
other and programs like Microsoft Excel Data Exchange and ODBC Driver to
“autofind” the current primary server based on a “base name” (hsserv in the
example) for the pair of servers.
It is important that the hsserva0 and hsservb0 names are both associated with the
X network, and the hsserva1 and hsservb1 names are both associated with the Y
network.
Station Network Redundancy
To configure Station Network redundancy, you use Station setup (menu option
Station
⇒
Connect) on each Station to define auxiliary setups that round robin
among any number of server connections (see “Single Network Configuration” on
page 306). The Station software works its way through the configured sequence
of connection setups until it finds a connection to the current primary server.
Stations connected to a single server on dual networks see two names for the
server (for example, hsserv0, hsserv1) and need two station setup files, each
pointing to the other in the Use redundant connection field.
Stations that are connected to redundant servers on dual networks see four
names for the pair of servers (for example, hsserva0, hsserva1, hsservb0,
hsservb1). These stations need four Station setup files, configured so that each
auxiliary setup field points to the next Station setup file in the desired round
robin sequence, with the fourth file pointing back to the first to complete the
loop (see “Configuring Stations for Server Redundancy” on page 317).
You must determine whether each Station will be on a single or a dual network.
If it is on a single network, just ensure that the IP network/subnetwork ID for that
Station’s NIC is consistent with other nodes attached to the network (i.e. X on the
X network, or Y on the Y network).
Stations connected to redundant servers on a single network see two server
addresses for the pair of servers (for example, hsserva0 and hsservb0 OR
hsserva1 and hsservb1. In this case there might still be a dual network present
and being used for the servers and some Stations; it is not mandatory to connect
all Stations to a dual network if one exists.
Redundant Server Network Redundancy
Server network redundancy between redundant servers is configured through
hdwbld (see “Defining the Redundant Connections” on page 311).
plscpcg.book Page 304 Monday, May 28, 2001 10:11 AM