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OpenBoot ok Prompt
A Sun Netra T5440 server with the Solaris OS installed operates at different run
levels. For a full description of run levels, refer to the Solaris system administration
documentation.
Most of the time, you operate a Sun Netra T5440 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 Netra T5440 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, before the operating system is installed the system comes up under
■
OpenBoot firmware control.
When the auto-boot? OpenBoot configuration variable is set to false, the
■
system boots to the ok prompt.
When the operating system is halted, the system transitions to run level 0 in an
■
orderly way.
When the operating system crashes, the system reverts to OpenBoot firmware
■
control.
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.
When you deliberately place the system under firmware control in order to
■
execute firmware-based commands, the OpenBoot firmware is in control.
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. Several ways to do
this are outlined in
see
"To Obtain the ok Prompt" on page
22
Sun Netra T5440 Server Administration Guide • April 2010
"Reaching the ok Prompt" on page
25.
23. For detailed instructions,
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