Installation guide

• In the unlikely event that the diagnostic test indicates hardware
failure, contact your Compaq field representative. Because
hardware damage is a serious problem, do not continue or try to
bypass the defective hardware.
• If you have enabled your system to boot automatically, press the
halt button to display the console prompt. Refer to the hardware
operator’s guide for the location of the halt button on your system.
4. Decide which startup mode you want to initiate:
• If you need to deny access to all users but root, plan to work in
single-user mode. After a crash, it is wise to work initially in
single-user mode. You should check all file systems thoroughly for
inconsistencies and perform other postcrash operations before
enabling system access to other users.
• If you need to allow access to you and to all other users with login
permission, plan to boot to one of the multiuser modes: multiuser
without networking or multiuser with networking.
5. Enter the required boot command.
Refer to Section 3.3 for the commands and procedures required to boot
your system.
3.3 Booting the System
The command that you use to boot the kernel depends on several factors:
• Processor type
• Run level
• Location of the kernel that you are booting (on the system disk or on a
remote server)
• Whether you are booting all processors or a single processor (in a
multiprocessor system)
• Whether any console environment variables are defined
• Whether you are booting the default kernel or an alternate kernel
3.3.1 Defining Console Environment Variables and Using Boot
Commands
To boot your system you need to understand the use of certain console
environment variables and their role in affecting the boot process. Table 3–1
lists each of the console environment variables and their associated actions.
If you are booting a DEC 2000 processor, refer to the hardware manual
that accompanied the processor for information on boot commands.
3–6 Starting Up and Shutting Down the System