HP BA322 90087 - Manual (Page 220)

System Response Value
Displays the SYSBOOT prompt and includes XDELTA but does not take the initial breakpoint. 3
Includes XDELTA and takes the initial breakpoint. 6
Includes XDELTA, displays the SYSBOOT prompt, and takes the initial breakpoint at system
initialization. 7
The following is an example of booting with XDELTA from fs1: at the EFI> prompt:
EFI> fs1:\efi\vms\vms_loader.efi -flags 0,7
For more information about using XDELTA, see the HP OpenVMS Delta/XDelta Debugger Manual.
B.6.11 Booting from a Different Root Directory
By default, the OpenVMS Integrity servers operating system is installed in the system root
directory [SYS0]. However, if you have created a cluster system disk, you can use the
SYS$MANAGER:CLUSTER_CONFIG_LAN.COM procedure to add a copy of the operating
system to a different root directory. (For more information about using the
SYS$MANAGER:CLUSTER_CONFIG_LAN.COM procedure, see the HP OpenVMS System
Manager's Manual .)
To boot from a different root (for example, [SYS3]), enter the following command at the EFI Shell
prompt, where fsn: (such as fs1:) is the device associated with the system disk:
Shell> fsn:\efi\vms\vms_loader.efi -flags 3,0
B.6.12 Emergency Booting
If a system problem prevents your system from booting, you might need to perform an emergency
boot operation.
Table B-3 summarizes these emergency boot operations, and the sections that
follow describe each boot operation in more detail.
Table B-3 Emergency Boot Procedures
When to Use Operation
When parameter values in the parameter file have been modified
so that the system is unbootable Booting with default system parameters
If an error in the startup or login procedure prevents you from
logging in Booting without startup and login procedures
If you have forgotten the password and cannot log in to a
privileged account Booting without the user authorization file
B.6.12.1 Booting with Default System Parameters
If the current values stored in the parameter file have been incorrectly modified, these incorrect
values might cause the system to become unbootable. With a conversational boot operation, you
can reset the active values for all system parameters to the default value. (In most cases, HP
recommends that you use AUTOGEN to modify system parameters. In certain cases, however,
you can use a conversational boot to modify a parameter value temporarily. To change a parameter
value permanently, you must edit MODPARAMS.DAT and run AUTOGEN. For instructions, see
the HP OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems.)
The default values allow you to boot the system temporarily so you can correct the problem.
How to Perform This Task
1. Begin the conversational boot by entering the following command at the EFI Shell prompt,
where fsn: (such as fs1:) is the device associated with the system disk:
Shell> fsn:\efi\vms\vms_loader.efi -flags 0,1
2. At the SYSBOOT> prompt, enter the following command:
220 Configuring OpenVMS Integrity servers Hardware Operation and Boot Operations, and Booting and Shutting Down Your
System