TS/MP 2.5 Release Supplement

Sensitive and Non-Sensitive SCF Commands
SCF commands that change the state or configuration of SCF objects are called sensitive commands.
These commands can be run only by Super ID users.
For more information on the SCF interface and SCF commands for the ACS subsystem, see “SCF
Command Reference for the ACS Subsystem” (page 62).
Before starting the TS/MP Pathsend requestors, you must use SCF commands to start the ACS
subsystem. For more information, see “Starting the ACS Subsystem ($ZACS)” (page 57).
Improved Application Availability
The ACS subsystem provides improved availability and scalability to Pathway/iTS 1.1 and other
TS/MP applications. It allows you to run multiple Pathway environments on multiple NonStop
systems, with replicated server classes, known as a single logical Pathway domain. During the
ACS subsystem configuration, pass the ACSCTL file (contains configuration information of the
Pathway applications grouped under a single logical domain name) location into the subsystem.
NOTE: During the ACS subsystem configuration, if you do not pass the ACSCTL file location into
the subsystem, all requests are sent only to the PATHMONs and not to the Pathway domain.
For information on the ACS subsystem configuration and startup, see “Installing and Configuring”
(page 53). For more information on the ACSCTL file syntax, see “ACSCTL File Configuration”
(page 18).
When Pathsend requests are sent to the Pathway domain (and not to a specific PATHMON process),
ACS core processes find the suitable PATHMON process and the server class to serve the Pathsend
request. When one of the participating PATHMON processes is brought down for a configuration
change, the send requests are automatically redirected to the other PATHMON processes to
maintain application availability. Similarly, when one server class under one PATHMON environment
is either frozen or brought down for a configuration change, the send requests are automatically
redirected to the same server class under other PATHMON processes in the same Pathway domain.
Figure 3 (page 17) depicts the Pathway domain concept in the ACS subsystem.
16 Application Cluster Services (ACS) Subsystem