Answer Posted / maz

Run Levels
A system's run level (also known as an init state) defines
what services and resources are available to users. A
system can be in only one run level at a time.

The Solaris OS has eight run levels, which are described in
the following table. The default run level is specified in
the /etc/inittab file as run level 3.

Table 17–2 Solaris Run Levels Run Level
Init State
Type
Purpose

0 Power-down state Power-down
To shut down the operating system so that it is safe to
turn off power to the system.

s or S Single-user state Single-user
To run as a single user with some file systems mounted and
accessible.

1 Administrative state Single-user
To access all available file systems. User logins are
disabled.

2 Multiuser state Multiuser
For normal operations. Multiple users can access the
system and all file system. All daemons are running except
for the NFS server daemons.

3 Multiuser level with NFS resources shared Multiuser
For normal operations with NFS resources shared. This is
the default run level for the Solaris OS.

4 Alternative multiuser state
Not configured by default, but available for customer use.

5 Power-down state Power-down
To shut down the operating system so that it is safe to
turn off power to the system. If possible, automatically
turns off power on systems that support this feature.

6 Reboot state Reboot
To shut down the system to run level 0, and then reboot to
multiuser level with NFS resources shared (or whatever
level is the default in the inittab file).

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