■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
The last of these scenarios most often concerns you as an administrator, since there will be times when you need to reach the ok prompt. The section “Methods to Reach the ok Prompt” on page 13 lists several ways. For detailed instructions, see “Obtaining the ok Prompt” on page 15.
Methods to Reach 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.
Note – These methods of reaching the ok prompt work only if the system console has been redirected to the appropriate port. For details, see “System Console OpenBoot Configuration Variable Settings” on page 17.
The methods are:
■Graceful shutdown
■ALOM system controller break and console command pair
■
■Manual system reset
Adiscussion of each method follows. For
Note – As a rule, before suspending the operating system, you should back up files, warn users of the impending shutdown, and halt the system in an orderly manner. However, it is not always possible to take such precautions, especially if the system is malfunctioning.
Graceful Shutdown
The preferred method of reaching the ok prompt is to shut down the operating system by issuing an appropriate command (for example, the shutdown, init, or uadmin command) as described in Solaris system administration documentation. You can also use the system Power button to initiate a graceful system shutdown.
Chapter 1 Configuring the System Console 13