topic Re: increase global sections in Operating System - OpenVMS

increase global sections

Sjors Takes — Wed, 01 Feb 2006 10:05:01 GMT

Hi all

For new s/w 190 global sections are required, but:

$write sys$output f$getsyi("free_gblsects")
163

I have modified modparams.dat:

MIN_GBLSECTIONS = 1200 (was 625)

After that I ran Autogen:

$@SYS$UPDATE:AUTOGEN GETDATA SETPARAMS

After a reboot, the free global sections were still 163. Why didn't this number increase?

Thanks in advance. Greetings, Sjors

Re: increase global sections

Wim Van den Wyngaert — Wed, 01 Feb 2006 10:15:14 GMT

Do your autogen again or check the output of the previous run. Sometimes autogen finds something suspiscious and cancels the setparams. You need to do the set params as

@SYS$UPDATE:AUTOGEN SETPARAMS

Wim

Re: increase global sections

Jim_McKinney — Wed, 01 Feb 2006 10:16:34 GMT

> Why didn't this number increase?

You only show what is free - not how many sections are SYSGENed. It is probable that the actual number of global sections was/is greater than 1200.

You'll want to get the current GBLSECTIONS value

$ write sys$output f$gets("gblsections")

and then increase your MIN_GBLSECTIONS value above that number.

Re: increase global sections

Peter Zeiszler — Wed, 01 Feb 2006 10:20:27 GMT

Check the SYS$SYSTEM:AGEN$PARAMS.REPORT and see what it has reports for the GBLSECTIONS value.

Re: increase global sections

Steven Schweda — Wed, 01 Feb 2006 10:23:40 GMT

ALP $ type SYS$MANAGER:GBL.COM
$ G = F$GETSYI( "GBLPAGES")
$ GF = F$GETSYI( "FREE_GBLPAGES")
$ GC = F$GETSYI( "CONTIG_GBLPAGES")
$ WRITE SYS$OUTPUT -
" Global pages: ''g', free: ''gf', contiguous: ''gc'."
$ G = F$GETSYI( "GBLSECTIONS")
$ GF = F$GETSYI( "FREE_GBLSECTS")
$ WRITE SYS$OUTPUT -
" Global sections: ''g', free: ''gf'."

ALP $ @ gbl.com
Global pages: 3679322, free: 3248256, contiguous: 3232992.
Global sections: 1350, free: 258.

Re: increase global sections

Robert_Boyd — Wed, 01 Feb 2006 11:27:35 GMT

Sjors,

You might download SHOW_NODE_INFO.COM from

http://dcl.openvms.org/stories.php?story=05/04/04/7482362

There is a section of information about global pages and global sections that is part of the output.

Robert

Re: increase global sections

Daniel Fernandez Illan — Thu, 02 Feb 2006 04:17:07 GMT

Sjors

Are you display file SYS$SYSTEM:AGEN$PARAMS.REPORT
to check some error message about MODPARAMS.DAT lines?
It is possible, if line refer to MIN_GBLSECTIONS is EXACTLY
MIN_GBLSECTIONS = 1200 (was 625)
that AUTOGEN has detected an error.

Line will be:

MIN_GBLSECTIONS = 1200 ! (was 625)

(See comment ! character)

Saludos.
Daniel.

Re: increase global sections

Sjors Takes — Thu, 02 Feb 2006 05:06:15 GMT

Thanks all.
@SYS$UPDATE:AUTOGEN GENPARAMS SETPARAMS FEEDBACK
Did the job.

Greets, Sjors

Re: increase global sections

John Gillings — Mon, 06 Feb 2006 21:09:56 GMT

Sjors,

>For new s/w 190 global sections are required, but:
>
>$write sys$output f$getsyi("free_gblsects")
163
>
>I have modified modparams.dat:
>
>MIN_GBLSECTIONS = 1200 (was 625)

The intended way to deal with this situation is in MODPARAMS.DAT:

ADD_GBLSECTIONS = 190 ! For product "new s/w"

Hopefully, each product with a specific requirement for GBLSECTIONS will have its own line and comment.

Re: increase global sections

Thomas Ritter — Mon, 06 Feb 2006 21:32:03 GMT

Sjors, some advice.
When changing system parameters and before rebooting use $ difference/parall to compare the before and after differences in parameters.
This very simple technique will save you.
Consider
+++
$ mc sysgen
use sys$system:alphavmssys.par !Real Version
set/output=users:[autogen]wiza_new_params.txt
show/all
show/special
!!!use sys$system:alphavmssys.old !Previous version
use users:[autogen]wiza_PARAMS_CURRENT.PAR
set/output=users:[sautogen]wiza_old_params.txt
show/all
show/special
exit
$
$differences/parallel/out=differences.lis wiza_new_params.txt wiza_old_params.txt
$type/p differences.lis
$exit
___
Also these days with gigabytes of RAM think big, but not too big. There is very little overhead in having some parameters configured generously.

We have not autogen our production cluster for over 2 years and work load has increased three fold ! Once you know your work mix and expected growth adjust
accordingly.

My AUS 2 cents.

Re: increase global sections

labadie_1 — Tue, 07 Feb 2006 05:02:00 GMT

In addition to the very good post by Ritter, I do, just after the autogen
$ sea sys$system:AGEN$PARAMS.REPORT; suspect

If the string "suspect" is found, this usually means that I have fat fingered a parameter, so my new value for gblsections will not be here, as I may have done a typo, such as
min_glbsections=1200
instead of
min_gblsections=1200

Re: increase global sections

Heinz W Genhart — Tue, 07 Feb 2006 05:14:02 GMT

After executing Autogen I do

$ DIFF/PAR SYS$SYSTEM:SETPARAMS.DAT

This way you can see every parameter changed during last Autogen

Further: Autogen searches for a procedure sys$update:agen$mail.com. If this procedure exists it will be executed by autogen.

I added
$ DIFF/PAR SYS$SYSTEM:SETPARAMS.DAT/out=sys$scratch:agen_diff.tmp
$ MAIL/SUBJECT="Autogen executed on ''F$GETSYI("NODENAME")'" sys$scratch:agen_diff.tmp 'mail_address'

to the procedure SYS$UPDATE:AGEN$MAIL.COM
This way I receive a Email with the differences after executing autogen.

Regards

Heinz