Technical data

Starting Up and Shutting Down the System
4.2 Booting with Modified System Parameter Values
2. At the SYSBOOT> prompt, enter a command in the following format:
USE file-spec
where file-spec specifies the file name and type of the alternate parameter file.
The file must be in SYS$SYSTEM. You cannot specify a device name. For
example:
SYSBOOT> USE ALTPARAMS.DAT
3. Enter the CONTINUE command to continue booting:
SYSBOOT> CONTINUE
Example
SYSBOOT> USE ALTPARAMS.DAT
SYSBOOT> CONTINUE
4.3 Assigning Port Allocation Classes with SYSBOOT
Compaq recommends that you use the CLUSTER_CONFIG procedure to define
port allocation classes. If this is not possible (for example, if you are booting
a private system disk into an existing cluster), you can use the SYSBOOT
SET/CLASS command to assign port allocation classes to shared SCSI ports. For
example, if port PKB is connected to a SCSI bus that another node has assigned
port allocation class 152, you would enter the following command:
SYSBOOT> SET/CLASS PKB 152
Be sure that the DEVICE_NAMING parameter is set to 1 to enable new
device-naming; for example:
SYSBOOT> SET DEVICE_NAMING 1
To deassign a port allocation class, enter the port name without a class number;
for example:
SYSBOOT> SET/CLASS PKA
4.4 Booting in an Emergency
If a system problem prevents your system from booting, you might need to
perform an emergency boot operation. Table 4–1 describes these emergency boot
operations.
Table 4–1 Emergency Boot Procedures
Operation Use
For More
Information
Booting with default
system parameters
When parameter values in the
parameter file have been modified
so that the system is unbootable
Section 4.4.1
Booting without startup
and login procedures
If an error in the startup or login
procedures prevents you from logging
in
Section 4.4.2
Booting without the user
authorization file
If you have forgotten the password and
cannot log in to a privileged account
Section 4.4.3
4–8 Starting Up and Shutting Down the System