The HP-UX Parallel rc Framework

start scr

ipt is represented by the name S019setboot. Within a run level, both start and kill scripts are

executed in ascending alphabetical order. The entire name of the script is used for ordering.

During the transition from a lower (existing) run level to a higher (destination) run level, all start scripts

in the intermediate run levels in ascending order are executed culminating in the execution of the start

scripts in the destination run level. For instance, while moving from run level 1 to run level 3, all start

scripts in run level 2 are executed followed by start scripts in run level 3.

During the transition from a higher (existing) run level to a lower (destination) run level, all kill scripts

in the intermediate run levels in descending order are executed culminating in the execution of kill

scripts in the destination run level. For instance, while moving from run level 3 to run level 1, all kill

scripts in run level 2 are executed followed by kill scripts in run level 1.

The traditional rc script sequencer uses the alphabetical ordering of script names to ensure accuracy.

It is left to the developer of the script to assign an appropriate sequence number for the script to run

accurately. For instance, if script Y has a dependency on script X, then the developer of script Y must

ensure that script Y has a greater sequence number than script X.

For more information on how the traditional rc script sequencer works, see the rc(1M) manpage.

Installing and Enabling the Parallel rc Execution

Infrastructure

The Parallel rc Framework is available as a separately installable bundle RCEnhancement in HP-UX

11i v3 Update 6. This bundle is not installed by default. The bundle contains the product PARLL-RC-

ENH which is the Parallel rc Framework. The Parallel rc Framework can be installed even if the system

is not upgraded to Update 6 of HP-UX 11i v3. The only prerequisite is that B.11.31.1003.02 or later

version of the RCEnhancement product is installed on the system.

For example, the product can be installed using the command:

swinstall –s /tmp/RCEnhancemnet.depot RCEnhancement

Once the bundle is installed, the Parallel rc Execution Infrastructure can be turned on and off using the

command line interface:

rcutil –e on

rcutil –e off

By default, the Parallel rc Execution Infrastructure is turned off. The current state of the framework can

be determined using the following command:

rcutil –q

The Working of the Parallel rc Framework

The Parallel rc Framework allows rc scripts to be executed in parallel. Using this framework the time

required to transition between run levels can be reduced. However, not all scripts can be executed in

parallel. Most scripts depend on some service or state enabled by other scripts. With the traditional rc

script sequencer, dependencies among scripts are taken care of by the alphabetical ordering of script

names. With the Parallel rc Framework, developers must explicitly specify the dependencies among

scripts.

Note: The RCEnhancement bundle comes with a set of dependencies for rc scripts delivered by HP in

the Data Centre Operating Environment (DCOE).

Dependencies

A script is considered to be dependent on another script when it requires services or operations set up

by another script. For example, script

is considered to be dependent on script

if script

requires