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

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?