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There are many background processes in Oracle cluster, how can we sort out the relationship among them? Let's try to explore. Let's start with the / etc/inittab file.

1. Contents of "/ etc/inittab" file

Take a look at what information is available from the Linux operating system "/ etc/inittab" file.

[root@rac1 ~] # cat / etc/inittab

#

# inittab This file describes how the INIT process should set up

# the system in a certain run-level.

#

# Author: Miquel van Smoorenburg

# Modified for RHS Linux by Marc Ewing and Donnie Barnes

#

# Default runlevel. The runlevels used by RHS are:

# 0-halt (Do NOT set initdefault to this)

# 1-Single user mode

# 2-Multiuser, without NFS (The same as 3, if you do not have networking)

# 3-Full multiuser mode

# 4-unused

# 5-X11

# 6-reboot (Do NOT set initdefault to this)

#

Id:5:initdefault:

# System initialization.

Si::sysinit:/etc/rc.d/rc.sysinit

L0:0:wait:/etc/rc.d/rc 0

L1:1:wait:/etc/rc.d/rc 1

L2:2:wait:/etc/rc.d/rc 2

L3:3:wait:/etc/rc.d/rc 3

L4:4:wait:/etc/rc.d/rc 4

L5:5:wait:/etc/rc.d/rc 5

L6:6:wait:/etc/rc.d/rc 6

# Trap CTRL-ALT-DELETE

Ca::ctrlaltdel:/sbin/shutdown-T3-r now

# When our UPS tells us power has failed, assume we have a few minutes

# of power left. Schedule a shutdown for 2 minutes from now.

# This does, of course, assume you have powerd installed and your

# UPS connected and working correctly.

Pf::powerfail:/sbin/shutdown-f-h + 2 "Power Failure; System Shutting Down"

# If power was restored before the shutdown kicked in, cancel it.

Pr:12345:powerokwait:/sbin/shutdown-c "Power Restored; Shutdown Cancelled"

# Run gettys in standard runlevels

1:2345:respawn:/sbin/mingetty tty1

2:2345:respawn:/sbin/mingetty tty2

3:2345:respawn:/sbin/mingetty tty3

4:2345:respawn:/sbin/mingetty tty4

5:2345:respawn:/sbin/mingetty tty5

6:2345:respawn:/sbin/mingetty tty6

# Run xdm in runlevel 5

X:5:respawn:/etc/X11/prefdm-nodaemon

H2:35:respawn:/etc/init.d/init.evmd run > / dev/null 2 > & 1 / dev/null 2 > & 1 / dev/null 2 > & 1

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