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8. After you set this variable, HP recommends that you set the boot device and operating
system flags as well, using the SET BOOTDEF_DEV and SET BOOT_OSFLAGS commands
described in the following sections.
A.2.2 Setting and Showing Boot Devices
Use the SET BOOTDEF_DEV command to tell the system which drive you want to boot from
(that drive becomes the default boot device). Use the SHOW BOOTDEF_DEV command to
display the current default boot device.
Note that when you set this variable, HP recommends that you set the operating system boot
parameters as well, using the SET BOOT_OSFLAGS command.
At the console prompt (>>>), enter the SET BOOTDEF_DEV command in the following format:
SET BOOTDEF_DEV device-name
Substitute the device name of the system disk for device-name. For example, to boot from a drive
with a device name of DKA400 on a DEC 3000 Alpha series computer, enter the following
command and press Enter:
>>> SET BOOTDEF_DEV DKA400
The next time you boot the system, you can enter the BOOT command without specifying a
device name (because DKA400 is now the default boot device). For example:
>>> BOOT
NOTE: If you have not used the SET BOOTDEF_DEV command to set the drive to boot from
and you enter the BOOT command without specifying a device name, the system displays an
error message.
Use the SHOW BOOTDEF_DEV command to find out what drive was specified in the last SET
BOOT command. For example:
>>> SHOW BOOTDEF_DEV
To cancel the drive specified in a previous SET BOOTDEF_DEV command, enter the following
command and press Enter:
>>> SET BOOTDEF_DEV
NOTE: This command is not valid on DEC 3000 Alpha series systems.
A.2.3 Setting Boot Flag Parameters
By default, when you boot the operating system, the flags parameter is set to 0. If you want to
define parameters to enable specific functions during the booting process, use the SET
BOOT_OSFLAGS console command.
The following is a list of values you can specify with the SET BOOT_OSFLAGS command.
NOTE: HP recommends that you keep the BOOT_OSFLAGS parameter at the default value 0
unless you have a specific need to change it (for example, to troubleshoot a system boot problem).
System ResponseHexadecimal Value
Allows a conversational boot (the system displays the SYSBOOT> prompt).1
Maps XDELTA to a running system.2
Stops the boot procedure at the initial system breakpoint.4
Performs a diagnostic bootstrap.8
Stops the boot procedure at the bootstrap breakpoints.10
Omits header from secondary bootstrap image.20
180 Booting and Shutting Down Your OpenVMS Alpha System