Compaq AlphaServer DS20, Руководство по обслуживанию

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System Overview 1-7
SRM Console
The SRM console is a command-line interface used to boot the Compaq Tru64 UNIX
and OpenVMS operating systems. It also provides support for examining and
modifying the system state and configuring and testing the system. The SRM console
can be run from a serial terminal or a graphics monitor.
AlphaBIOS Console
The AlphaBIOS console is a menu-based interface that supports the Microsoft
Windows NT operating system. AlphaBIOS is used to set up operating system
selections, boot Windows NT, and display information about the system configuration.
The ISA Configuration Utility and the RAID Standalone Configuration Utility are run
from the AlphaBIOS console. AlphaBIOS runs on either a serial terminal or graphics
terminal. Windows NT requires a graphics monitor.
Environment Variables
Environment variables are software parameters that define, among other things, the
system configuration. They are used to pass information to different pieces of
software running in the system at various times. The os_type environment variable,
which can be set to VMS, UNIX, or NT, determines which of the two consoles is used.
The SRM console is always brought into memory, but AlphaBIOS is loaded if os_type
is set to NT and the Halt LED is not lit.
Refer to Appendix A of this guide for a list of the environment variables used to
configure a system.
Refer to your system User’s Guide for information on setting environment variables.
Most environment variables are stored in the NVRAM area of the flash ROM on the
system board. It is recommended that you keep a record of the environment variables
for each system that you service. Some environment variable settings are lost when a
module is swapped and must be restored after the new module is installed. Refer to
Appendix A for a convenient worksheet for recording environment variable settings.