Compaq DS10L - AlphaServer - 256 MB RAM Reference Manual page 30

The bootdef_dev environment variable specifies the default boot
device.
The show device command displays device information, including
name and type of connection to the system. See Section 2.3.2 for a
description of the show device command and the device naming
convention.
The disk dua110.0.0.8.0 is on the cluster that includes this system.
No boot device is specified in the boot command; the default boot
device was set with the environment variable. See Section 2.5 for a
description of the boot command.
The boot command accepts the name of a boot device, a boot file
name through the -file option, and boot flags through the -flags
option. The environment variables bootdef_dev, boot_file, and
boot_osflags can also be used to specify the default boot device or
device list, the default boot file, and flag information. When an option
and the corresponding environment variable are both in a command
string, the option overrides the environment variable. The value of
the environment variable, however, is not changed. See Section 2.18
for information about environment variables.
The operating system banner prints.
DS10 / DS10L Console Reference
1-18