About The Ok Prompt; Entering The Ok Prompt - Sun Microsystems Sun Fire V445 Server Administration Manual

About the ok Prompt

A Sun Fire V445 server with the Solaris OS installed is capable of operating at
different run levels. A synopsis of run levels follows. For a full description, see the
Solaris system administration documentation.
Most of the time, you operate a Sun Fire V445 server at run level 2 or run level 3,
which are multiuser states with access to full system and network resources.
Occasionally, you might operate the system at run level 1, which is a single-user
administrative state. However, the lowest operational state is run level 0. At this
state, it is safe to turn off power to the system.
When a Sun Fire V445 server is at run level 0, the ok prompt appears. This prompt
indicates that the OpenBoot firmware is in control of the system.
There are a number of scenarios in which OpenBoot firmware control can happen.
By default, the system powers up to OpenBoot firmware control before the OS is
installed.
The system boots to the ok prompt when the auto-boot? OpenBoot
configuration variable is set to false.
The system transitions to run level 0 in an orderly way when the OS is halted.
The system reverts to OpenBoot firmware control when the OS crashes.
When a serious hardware problem develops while the system is running, the OS
transitions smoothly to run level 0.
You deliberately place the server under firmware control in order to execute
firmware-based commands or to run diagnostic tests.
It is the last of these scenarios that most often concerns you as an administrator,
since there will be times when you need to reach the ok prompt. The several ways to
do this are outlined in
instructions, see "Entering the ok Prompt" on page

Entering the ok Prompt

There are several ways to enter the ok prompt, depending on the state of the system
and the means by which you are accessing the system console. In order of
desirability, these are:
Graceful shutdown
ALOM system controller break or console command
L1-A (Stop-A) keys or Break key
Externally initiated reset (XIR)
"Entering the ok Prompt" on page
Chapter 2 Configuring the System Console
35. For detailed
40.
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