Warm Start; Cold Start - Setting A Default Disk - Digital Equipment VAX 6000 Series Operation Manual

4–6 System Boot Procedures

4.4.1 Warm Start

If you set the lower keyswitch on your VAX 6000 series console to
Auto Start, the system will restart automatically under the following
conditions:
• When the system power comes on after a power failure
• After an error halt
This type of automatic restart is known as a warm start because the
backup battery unit supplies enough power to preserve the contents of
memory.
4.4.2 Cold Start — Setting a Default Disk
If you shut down the system and then specify Y at the auto reboot prompt,
the system will restart automatically only if you have designated a default
boot device prior to the shutdown. This type of automatic restart is known
as a cold start because the memory is reinitialized before the system
reboots.
To specify a default boot device, use the SET BOOT command in the
following format:
>>> SET BOOT DEFAULT ddu
For example, to define DU0 as the default boot device, enter the following:
>>> SET BOOT DEFAULT DU0
Because the /XMI and /BI qualifiers are not specified, the system uses
their default values.
The next time you enter the BOOT command, the system will boot from
the designated default boot device. To clear the default designation, enter
the following:
>>> SET BOOT DEFAULT
To use any SET command, the lower keyswitch must be in the
Update position.
NOTE