skip book previous and next navigation links
go up to top of book: HP OpenVMS System Manager's Manual, Volume 1:... HP OpenVMS System Manager's Manual, Volume 1:...
go to beginning of chapter: Starting Up and Shutting Down the System Starting Up and Shutting Down the System
go to previous page: Understanding Booting and System Startup Understanding Booting and System Startup
go to next page: Assigning Port Allocation Classes with SYSBOOTAssigning Port Allocation Classes with SYSBOOT
end of book navigation links

Booting with Modified System Parameter Values  



Using a conversational boot, you can modify system parameter values as follows:

Task For More Information
Boot after showing or modifying individual system parameter values
Booting After Showing or Modifying Individual System Parameter Values
Boot with an alternate system parameter file
Booting with an Alternate System Parameter File
Boot with default values for system parameters
Booting with Default System Parameters

Before using a conversational boot to show or modify system parameter values, you must be familiar with the following terms:

Term Definition
Active values
System parameter values stored in memory and used by the active system.
Current values
System parameter values stored in the default parameter file. When the system boots, it sets active values for system parameters using the current values.

On VAX systems, the default system parameter file is SYS$SYSTEM:VAXVMSSYS.PAR.1

On Alpha systems, the default system parameter file is SYS$SYSTEM:ALPHAVMSSYS.PAR.2

On I64 systems, the default system parameter files is IA64VMSSYS.PAR.3
Default values
System parameter values stored in the default list and used by default.

For more information about system parameters, see the HP OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems.

Booting After Showing or Modifying Individual System Parameter Values  

In a conversational boot operation, you can show and modify values for individual parameters.4 The system modifies the values both in memory and in the system parameter file.

How to Perform This Task

  1. Follow the instructions for performing a conversational boot in one of the following manuals:
  2. At the SYSBOOT> prompt, enter SHOW and SET commands to show and change the value of system parameters. For example:
    SYSBOOT> SET UAFALTERNATE 1
    For information about SET and SHOW commands, refer to HP OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems (SYSGEN).
  3. Enter the CONTINUE command to continue booting:
    SYSBOOT> CONTINUE

Example

SYSBOOT> SHOW UAFALTERNATE
Parameter Name            Current    Default     Min.     Max.     Unit 
Dynamic
--------------            -------    -------    -------  -------   ---- 
UAFALTERNATE                    0          0         0         1   Boolean
SYSBOOT> SET UAFALTERNATE 1
SYSBOOT> CONTINUE

Booting with an Alternate System Parameter File  

In programming research and development environments where you must alter operating conditions for experimentation, testing, and debugging, you might want to temporarily boot your system using system parameter values stored in a parameter file other than the default parameter file. The conversational boot operation lets you reset active values using a different parameter file.

How to Perform This Task

  1. Follow the instructions for performing a conversational boot in one of the following manuals:
  2. At the SYSBOOT> prompt, enter a command in the following format: USE file-specwhere 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

Footnotes
1VAX specific
2Alpha specific
3I64 specific
4

In most cases, HP recommends that you use AUTOGEN to modify system parameters. In special 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.

( Number takes you back )


go to previous page: Understanding Booting and System Startup Understanding Booting and System Startup
go to next page: Assigning Port Allocation Classes with SYSBOOTAssigning Port Allocation Classes with SYSBOOT