From: pSeries AIX Geek (aixgeek@YAHOO.COM)
Date: Wed Jan 22 2003 - 23:58:08 EST
Here's something I dug up:
From:
http://publib16.boulder.ibm.com/pseries/en_US/aixprggd/kernextc/configdump.htm
When you install the operating system, the dump device
is automatically configured for you. By default, the
primary device is /dev/hd6, which is a paging logical
volume, and the secondary device is /dev/sysdumpnull.
Note
If your system has 4 GB or more of memory, the default
dump device is /dev/lg_dumplv, and is a dedicated dump
device.
...
If you are using AIX 4.3.2 or later, compressing your
system dumps before they are written to the dump
device will reduce the size needed for dump devices.
Refer to the sysdumpdev command for more details.
Starting with AIX 5.1, the dumpcheck facility will
notify you if your dump device needs to be larger, or
the file system containing the copy directory is too
small. It will also automatically turn compression on
if this will alleviate these conditions. This
notification appears in the system error log. If you
need to increase the size of your dump device, refer
to the article in this publication, Increasing the
Size of a Dump Device.
I suspect that Erik was seeing an LV called lg_dumplv,
which you would get on a NEW install of AIX 5.1 on a
machine larger than 4GB of memory.
Look at the /usr/lpp/bosinst/bi_main script for
details.
It would appear that you have to adjust for names of
hd7, hd6, or lg_dumplv for your dump LV names.
- pAG
--- "Saxon, Lamar" <Lamar.Saxon@AMERICREDIT.COM>
wrote:
> Sounds like someone create those. hd7 is what we
> use ( hd71 primary & hd72
> secondary ); but that is a throwback to my 3.2.5
> days...
>
> Lamar
>
> -----Original Message-----
> From: Erik Ian Kennedy [mailto:erikiken@YAHOO.COM]
> Sent: Wednesday, January 22, 2003 9:20 PM
> To: aix-l@Princeton.EDU
> Subject: Re: 2 dump questions
>
>
> I have seen some AIX 5 systems with an LV of
> "dump_lv"
> or "dumplv". How or when does this get generated?
> Migrated machines keep their hd7 name, of course.
>
> Erik
>
> --- "Saxon, Lamar" <Lamar.Saxon@AMERICREDIT.COM>
> wrote:
> > 1. Yes. On the S85 it is done via the operator
> > panel. I do not have the
> > sequence off hand; but it is in your service guide
> > and in the AIX online
> > documentation. On the H70, it is simply hit the
> > reset button. BUT, you
> > must have always allow dump ( -K ) set to TRUE;
> not
> > false.
> >
> > 2. The dump device on a fresh install of AIX
> since
> > version 4 is set to hd6
> > or paging space.
> >
> > HTH,
> > Lamar
> >
> > -----Original Message-----
> > From: Erik Ian Kennedy [mailto:erikiken@YAHOO.COM]
> > Sent: Wednesday, January 22, 2003 7:46 PM
> > To: aix-l@Princeton.EDU
> > Subject: 2 dump questions
> >
> >
> > 1. I was discussing AIX dump devices with a
> friend.
> > He claims that if you have no console attached to
> an
> > H70 and/or S85, you can't force a dump. I always
> > thought that there was a power/reset key sequence
> on
> > the H70 and/or S85 you could use to initiate a
> dump
> > if
> > the system hung.
> >
> > [I do know you have to have the "always allow
> dump"
> > set to FALSE.]
> >
> > 2. On a FRESH install of AIX, is the dump device
> > called hd7 or dump_lv? I'd heard the latter, but
> > I've
> > seen on migrated machines that it retained the hd7
> > name.
> >
> >
> > - Erik
> >
> > __________________________________________________
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