Technical data

Starting Up and Shutting Down the System
4.4 Booting in an Emergency
$ EDIT SYS$SYSTEM:MODPARAMS.DAT
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[Insert the following line in MODPARAMS.DAT:]
MIN_NPAGEDYN = 2999808
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$ @SYS$UPDATE:AUTOGEN SAVPARAMS REBOOT
4.4.2 Booting Without Startup and Login Procedures
If the system does not complete the startup procedures or does not allow you to
log in, bypass the startup and login procedures. The startup and login procedures
provided by Compaq should always work. However, if you introduce an error
when modifying the startup or login procedures, you can accidentally lock
yourself out of the system. The following instructions tell you what to do in such
a situation.
How to Perform This Task
1. Perform a conversational boot operation by following the instructions in one
of the following manuals:
• On VAX systems, refer to the most recent versions of the OpenVMS
VAX Upgrade and Installation Manual and the upgrade and installation
supplement for your VAX computer.
• On Alpha systems, refer to the most recent version of the OpenVMS
Alpha Upgrade and Installation Manual.
2. Enter the following command at the SYSBOOT> prompt:
SYSBOOT> SET/STARTUP OPA0:
3. Enter the CONTINUE command to continue booting:
SYSBOOT> CONTINUE
4. When the system is booted, the operator console displays the DCL command
prompt ($). You are logged in.
5. Enter the following DCL command:
$ SET NOON
This command directs the operating system to ignore any errors that might
occur. If you do not enter this command and you invoke an error, the system
will log you out.
6. Correct the error condition that caused the login failure. That is, make the
necessary repairs to the startup or login procedures, or to the UAF.
Invoke a text editor to correct the file. Note that some system consoles might
not supply a screen-mode editor. You can also copy a corrected file and delete
the incorrect version by using the RENAME and DELETE commands.
7. Invoke SYSMAN and enter the following commands to reset the startup
procedure:
4–10 Starting Up and Shutting Down the System