Transfer: the birthplace and tracking exploration of evmd, cssd and crsd, the important processes of Oracle cluster.
Http://www.xuexizu.com/training_centre/content/111841?nid=30538
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
