Administration Guide > Installation > New Installation > Distributed Server Environment

Distributed Server Environment

Server processes can be installed on several computers in order to increase system stability.

This requires some extra specifications, which are described below:

The computer that contains the work process that connects to the AE system first becomes the active Automation Engine if AE.Nonstop-Server is licensed. Without this special license, all server processes participate in processing.

The computers on which the server processes are installed must have the same platform for operating with multiple Servers (for example, two computers with HP/UX). It is not possible to use computers with different UNIX derivatives or a mixture of UNIX and Windows.

The databaseA database is an organized collection of data including relevant data structures. scheme has been designed to support five communication processes. Additional tables must be prepared if more communication processes are required. Contact theTechnical Support Team for more information about additional tables.

Procedure

	1.	Installing the Automation Engines

Server computer
Install the Automation Engine on the particular computers as described in the relevant documentation about new installation.

	2.	Setting up the system environment

Server computer
Adjust the INI file UCSRV.INI for each computer:

Enter the same system name (maximum 8 characters, no special characters) in all INI files.
Activate the SNMP connection (if used) with the parameter snmp=.
Enter the connection information to the AE database in the section [ODBC].
Enter the same port number for the primary work process in all INI files (parameter pwpport=).
Adjust the section [PORTS] in all INI files. The server processes defined in this section participate in the AE system's processing. The following rules apply:

Port numbers must be unique even if they are distributed among several computers.
The same guideline applies to server process names. Numbers must be used in ascending order; omitting numbers is not permitted. The following example illustrates a distributed Server environment with two communication processes and four work processes (cp1, cp2, wp1, wp2, wp3, wp4).

Leave the original list of server processes in the INI file. Non-required entries can be commented with a semi-colon. This can be helpful if you use two INI files; one file can contain even server process numbers, the other one the uneven numbers.

Short INI file version of computer A:

[PORTS]
cp1=2217
;cp2=2218
;cp3=2219
;cp4=2220
;cp5=2221
wp1=2271
;wp2=2272
wp3=2273
;wp4=2274
;wp5=2275
;wp6=2276
;wp7=2277
;wp8=2278
;wp9=2279

Short INI file version of computer B:

[PORTS]
;cp1=2217
cp2=2218
;cp3=2219
;cp4=2220
;cp5=2221
;wp1=2271
wp2=2272
;wp3=2273
wp4=2274
;wp5=2275
;wp6=2276
;wp7=2277
;wp8=2278
;wp9=2279

	3.	Starting and stopping the Automation Engine

Server computer
Use the ServiceManager Dialog to start or stop server processes.