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PSU and One-off patching on GRID Home

spiralJun 5 2012 — edited Jun 5 2012
Grid Infrastructure Version: 11.2.0.2

Question1.
Do you apply one-off patches for GI HOME? I have only applied PSUs on Grid Home . I have never applied a one-off patch on a Grid HOME.
So, I thought of downloading a GRID related one-off patch for AIX . So, I looked for
12767231 - AIX-11202-GIPC DISABLE SWITCH PORT FOR ONE PRIVATE NIC,HAIP DID NOT FAILOVER
which is part of GI PSU 11.2.0.2.4 ( 12827731).

But when I searched for the one-off patch 12767231 in patch search in Metalink, I couldn't find the patch download for this particular bug.
I think you can apply this one-off patch only as a part of PSU. Right?


Question2.
Why on earth should I apply GI's PSU(or one-off patch) on RDBMS_HOME or vice versa?

RAC Databases run on the top of CRS stack.
Although related ,both GRID HOME and RDBMS HOME contain different binary files doing different things. So why should we apply GI's PSU/one-off patch on RDBMS_HOME and RDBMS_HOME's PSU on GRID Infrastructure HOME?

Question3.
We install grid using Grid Installer GUI. When doing a fresh installation of 11.2.0.2 or 11.2.0.3 in a new server , I want to apply its latest PSU as well. When should I do this PSU patching ?

A. Before running root.sh ?

One of last screens we get in Grid Installation is where the installer prompts you to run root.sh (see the screenshot below)
http://husnusensoy.files.wordpress.com/2009/10/camtasiastudio351.png

Should I do the PSU patching now ? ie just before executing root.sh ?

B. or After running root.sh ? ie. After the whole Grid Installation is succesfully complete ?

Edited by: spiral on 05-Jun-2012 17:16
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Locked on Jul 3 2012
Added on Jun 5 2012
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