System Management Guide: Operating System and Devices

Starting the System Resource Controller

The System Resource Controller (SRC) is started during system initialization with a record for the /usr/sbin/srcmstr daemon in the /etc/inittab file. The default /etc/inittab file already contains such a record, so this procedure might be unnecessary. You can also start the SRC from the command line, a profile, or a shell script, but there are several reasons for starting it during initialization:

• Starting the SRC from the /etc/inittab file allows the init command to restart the SRC if it stops for any reason.
• The SRC is designed to simplify and reduce the amount of operator intervention required to control subsystems. Starting the SRC from any source other than the /etc/inittab file is counterproductive to that goal.
• The default /etc/inittab file contains a record for starting the print scheduling subsystem (qdaemon) with the startsrc command. Typical installations have other subsystems started with startsrc commands in the /etc/inittab file as well. Because the srcmstr command requires the SRC be running, removing the srcmstr daemon from the /etc/inittab file causes these startsrc commands to fail.

See the srcmstr command for the configuration requirements to support remote SRC requests.

Prerequisites

• Reading and writing the /etc/inittab file requires root user authority.
• The mkitab command requires root user authority.
• The srcmstr daemon record must exist in the /etc/inittab file.

Procedure

Note: This procedure is necessary only if the /etc/inittab file does not already contain a record for the srcmstr daemon.

1. Make a record for the srcmstr daemon in the /etc/inittab file using the mkitab command. For example, to make a record identical to the one that appears in the default /etc/inittab file, type:

   mkitab -i fbcheck srcmstr:2:respawn:/usr/sbin/srcmstr
   

   The -i fbcheck flag ensures that the record is inserted before all subsystems records.

2. Tell the init command to reprocess the /etc/inittab file by typing:

   telinit q
   

   When init revisits the /etc/inittab file, it processes the newly entered record for the srcmstr daemon and starts the SRC.