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 BOOT command in the following format:
BOOT -FLAGS 0,1 [device-name]
For device-name, substitute the device name of the drive from which you want to boot. For
example, if the system disk has a device name of DKA400, enter the following command
and press Enter:
>>> BOOT -FLAGS 0,1 DKA400
2. At the SYSBOOT> prompt, enter the following command:
SYSBOOT> USE DEFAULT
The USE DEFAULT command specifies that default values should be used for all parameters.
3. To avoid starting all layered products on a system that is not tuned for them, possibly causing
the system to hang, set the STARTUP_P1 system parameter as follows:
SYSBOOT> SET STARTUP_P1 “MIN”
4. Enter the following command to ensure that the operating system does not record for
subsequent system reboots the STARTUP_P1 parameter change you made in step 3:
SYSBOOT> SET WRITESYSPARAMS 0
5. Enter the following command to continue booting:
SYSBOOT> CONTINUE
6. When the system finishes booting, determine which changed parameter caused the problem
and reset the parameter value. If you specified the value for the parameter in the AUTOGEN
parameter file MODPARAMS.DAT, fix the value in that file and run AUTOGEN. For more
information, see the HP OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring,
and Complex Systems.
7. After your system runs for at least 24 hours, run AUTOGEN in feedback mode, following
the steps described in Section 7.24 (page 162). Be sure to examine the
AGEN$PARAMS.REPORT, as recommended. If necessary, modify system parameters as
instructed in Section 7.25 (page 164). If you need assistance, contact your software support
representative. Once you feel confident that the problem is corrected, and AUTOGEN has
been run through the SETPARAMS phase, reboot the system.
Example
SYSBOOT> USE DEFAULT
SYSBOOT> SET STARTUP_P1 “MIN”
SYSBOOT> SET WRITESYSPARAMS 0
SYSBOOT> CONTINUE
Username: SYSTEM
Password:
$ EDIT SYS$SYSTEM:MODPARAMS.DAT
.
.
.
[Insert line(s) to reset parameter value(s)]
.
.
.
176 Booting and Shutting Down Your OpenVMS Alpha System
