Re: What are the concerns about performing a slip install? -- MIDRANGE-L

Resave level is the hardware support in the OS. If you load too old of a re-save level and you have newer hardware, that hardware wouldn't be recognized. The risk is very low that this would be a problem, but if someone has a very old cut of the OS on DVD and it's been a few years, using that copy of the OS for a slip install could be an issue.

Gavin.

On 1/6/2025 5:44 AM, Rob Berendt wrote:

Gavin,

#1: I mentioned that many use a custom program in an effort to avoid going
off on that distraction. It is a technique that I use too.
#2: Why would I want to use the same resave level as the one I'm
replacing? Isn't the goal often to get to the latest resave level to ease
the PTF apply? This, I really want to know the thought process behind.

On Sun, Jan 5, 2025 at 7:26 PM Gavin Inman<midrangelist@xxxxxxxxxxxxxx>
wrote:

Use your most recent FULL SYS tape to do this or I would make sure your
slip is at the same resave level as the one your replacing.

As for changed system commands; I always created a program called
SYSCHGPGM which was a CL to re-apply any and all system command defaults
and changes.
Documentation is key for this as any change needs to be updated in this
program.
After any installs, such as this, simply run the syschgpgm and Bing bang
boom, all of your custom settings are back.

Gavin Inman

On 1/5/2025 11:01 AM, Rob Berendt wrote:

A slip install is where you do a reinstall of lic and just the Base OS
without initializing the system. Prior to TRs this might have to be done
for certain OS upgrades. Namely V5RxM5 and 6.1.1. It was often done if
your PTFs got way behind and you got a link loader error or you just wanted
to be really sure to start somewhat clean before applying PTFs.
Documentation about this is available at

https://www.ibm.com/docs/en/i/7.2?topic=iudirs-replacing-licensed-internal-code-i-same-version-release

What are the concerns about doing this?

First: Commands in which you may have changed the command defaults. Some
people have a program they run to change their defaults after every (IPL,
upgrade, PTF, etc). If not, one technique is to check the column APAR_ID
for CHGDFT in OBJECT_STATISTICS. Prior to that existing, or having the
column APAR_ID (like this 7.2 system I'm looking at) you would DSPOBJD
commands to an outfile and look for
select ODLBNM, ODOBNM, ODOBTP, ODUMOD, ODAPAR
from rberendt.dspcmd
where odapar = 'CHGDFT'
order by odlbnm, odapar desc, odumod desc

What other concerns can you think of?

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