HP OpenVMS 8.x manual Modifying System Parameters After an Upgrade, System File Sizes

Models: OpenVMS 8.x

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Enter numeric values as integers without commas (for example, 10000). Enter alphabetic characters in lower or uppercase.

HP recommends that you include comments in the MODPARAMS.DAT file indicating who changed the value, when it was done, and why it was done. An exclamation point (!) serves as a comment starter and can appear anywhere on a line. The following example illustrates the modifications recommended in the preceding bulleted items:

!the following changes made by K.Newcomb on 9/20/03

SWAPFILE=0

! don’t re-size the SWAPFILE on AUTOGEN runs

MIN_gblsections=750

! required for DECwindows MOTIF

 

MIN_NPAGEDYN=2750000

! set npagedyn to a min of 2.75

million

For more information about the MODPARAMS.DAT file and about using AUTOGEN in general, see the HP OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems.

7.23.2 Modifying System Parameters After an Upgrade

Review the file SYS$SYSTEM:MODPARAMS.DAT. The upgrade procedure created a new version of this file. The old version is named SYS$SYSTEM:MODPARAMS.DAT_OLD. The new MODPARAMS.DAT file contains all the parameters in the old file, plus various parameters that the upgrade procedure added to ensure that all necessary system parameters are properly propagated from the earlier version of OpenVMS. The upgrade procedure also adds comment lines to explain the source of the parameters in each section of the new MODPARAMS.DAT file.

Note that the old MODPARAMS.DAT is included in the new MODPARAMS.DAT each time an upgrade is performed. Because of this, if MODPARAMS.DAT is not reviewed and cleaned up after each upgrade, it might eventually contain many levels of duplicated parameters. For this reason, you should review MODPARAMS.DAT after each upgrade. This enables you to eliminate any duplication. You can also take this opportunity to modify any parameters, if necessary.

Based on your examination of AGEN$PARAMS.REPORT, you might need to modify parameter values in MODPARAMS.DAT.

The following subsections are examples of instances where you need to modify parameters in

MODPARAMS.DAT.

7.23.2.1 System File Sizes

AUTOGEN sets the following files at sizes appropriate for your system:

[SYSEXE]SYSDUMP.DMP

[SYSEXE]PAGEFILE.SYS

[SYSEXE]SWAPFILE.SYS

If you have special workloads or configurations, you can specify different sizes for these files by performing the following steps:

1.Log in to the SYSTEM account.

2.Enter the following command:

$ @SYS$UPDATE:AUTOGEN SAVPARAMS TESTFILES

3.If the file sizes displayed need to be adjusted, add symbols to the MODPARAMS.DAT file (described in detail in the HP OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems), and repeat step 2 until you are satisfied with the file sizes.

4.When you are satisfied with the file sizes, enter the following command to ensure that the modified system files are installed when the system is rebooted:

$ @SYS$UPDATE:AUTOGEN GENPARAMS SETPARAMS

7.23.2.2OpenVMS Cluster Parameters

If you are upgrading an OpenVMS Cluster system, note the following:

146 After Installing or Upgrading the OpenVMS Operating System

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HP OpenVMS 8.x manual Modifying System Parameters After an Upgrade, System File Sizes, OpenVMS Cluster Parameters