Based on your examination of AGEN$PARAMS.REPORT, you might
need to modify parameter values in MODPARAMS.DAT. Read the notes
in
General Notes About Modifying System Parameters. These notes
apply both to modifications being made after a new installation
or after an upgrade. If you are modifying system parameters after
an upgrade, see also
Modifying System Parameters After an Upgrade.
General
Notes About Modifying System Parameters In modifying system parameters, note the following:
In general, you should allow AUTOGEN
to calculate system parameters. You can hardcode values (such as
GBLPAGES=value), but doing so overrides AUTOGEN and might not allow
it to set an optimal value based on observed usage.
Whenever possible, use MIN_parameter values (such
as MIN_GBLPAGES) to set the minimum value that can be set for a
parameter by AUTOGEN. AUTOGEN increases the value if necessary. It
will also adjust related parameters, unless they are hardcoded,
in which case information will be provided in the AGEN$PARAMS.REPORT
file. Use MAX_parameter values to set a maximum value when it is
necessary to limit a parameter to a known maximum value (this is
rarely necessary).
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
is an example illustrating 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, refer torefer to the HP OpenVMS System Manager's Manual, Volume 2: Tuning, Monitoring, and Complex Systems.
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 allows 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.
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 work loads or configurations, you can
specify different sizes for these files by performing the following
steps:
Log in to the
SYSTEM account.
Enter the following command:
$ @SYS$UPDATE:AUTOGEN SAVPARAMS TESTFILES
If the file sizes displayed need to be adjusted,
add symbols to the MODPARAMS.DAT file (described in detail in the
chapter entitled "Managing System Parameters" 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.
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
OpenVMS Cluster Parameters If you are upgrading an OpenVMS Cluster system, note the following:
The upgrade procedure creates a new
MODPARAMS.DAT for each system root on your system disk. Normally,
there is one root for each Alpha computer that boots from the system
disk. You must review each of these MODPARAMS.DAT files. The MODPARAMS.DAT file for the system on which you are running
is located in SYS$SYSTEM:MODPARAMS.DAT. The MODPARAMS.DAT files
for other roots on the same system disk can be found in SYS$SYSDEVICE:[SYSx.SYSEXE]MODPARAMS.DAT, where x represents
the root number; for example, SYS0, SYS1, SYS2, and so forth. (Valid
root numbers may include hexadecimal digits -- SYSA, SYSB, and so
forth.)
Be sure the EXPECTED_VOTES value is correct. This
value is the sum of all VOTES in the cluster. For example, if there
are five Alpha computers in the cluster and each has one VOTE, the
value is 5.
As you reboot each Alpha computer, AUTOGEN runs
automatically. The cluster forms when you have booted enough computers
to attain cluster quorum.
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