10 Netra 440 Server System Administration Guide • August 2004
When a Netra 440 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 under which OpenBoot firmware control can occur.
■By default, the system comes up under OpenBoot firmware control before the
operating system 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 operating
system is halted.
■The system reverts to OpenBoot firmware control when the operating system
crashes.
■During the boot process, when there is a serious hardware problem that prevents
the operating system from running, the system reverts to OpenBoot firmware
control.
■When a serious hardware problem develops while the system is running, the
operating system transitions smoothly to run level 0.
■You deliberately place the system under firmware control in order to execute
firmware-based commands or to run diagnostic tests.
It is the last of these scenarios which most often concerns you as an administrator,
since there will be times when you need to reach the ok prompt. Several ways to do
this are outlined in “Reaching the ok Prompt” on page 10. For detailed instructions,
see “Getting to the ok Prompt” on page 13.
Reaching the ok Prompt
There are several ways to reach 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)
■Manual system reset
A discussion of each method follows. For step-by-step instructions, see “Getting to
the ok Prompt” on page 13.