Re: Reinstall OS completely without reinstalling Oracle

From: Karl Arao <karlarao_at_gmail.com>
Date: Sun, 23 Oct 2011 02:43:40 -0500
Message-ID: <CACNsJnf3R+by=GuDr1ox2LDqsvKwpFkM01+-vLX1z1iaQyKHag_at_mail.gmail.com>

BTW, this may still be related to the OS upgrade.. I've read earlier this article which basically does updates on the kernel

Using Oracle Ksplice to Update Oracle Linux Systems Without Rebooting http://www.oracle.com/technetwork/articles/servers-storage-admin/ksplice-linux-518455.html

I thought of this article as a full OS upgrade just like your case.. but it seems like it is really just the kernel upgrade/patches..

then I tweeted _at_wimcoekaerts just out of curiosity.. @wimcoekaerts Do I still have to relink my Oracle Home even I use ksplice for OS upgrade? goo.gl/R13Op

this is his response _at_karlarao <http://twitter.com/karlarao> No. ksplice isn't really "os upgrade" in the normal sense. it updates the running kernel (in memory). no need to relink or restart

So on my notes on the section "APPENDIX A - Some FAQs about relinking" http://docs.google.com/fileview?id5H46jS7ZPdJNGU0NDljZDktMzUwMC00ZWQ4LWIwZDgtNjFlYzNhMzQyMjg0&hl=en I had this question before:

6) What if I just did a kernel upgrade (2.6.9-old to 2.6.9-newer), and not a full OS upgrade (from oel4.4 to 4.6), would I still have to relink? The kernel upgrade just updates the
hardware modules (/lib/modules) which is not related to the gcc binaries or libraries used to compile the binaries of Oracle… the /usr/lib/gcc-lib is not affected when you do a
kernel upgrade…

Answer: If you are just upgrading the kernel, no need to relink. If it's affecting the system libraries, then you have to relink

-Karl

On Sat, Oct 22, 2011 at 10:47 PM, Karl Arao <karlarao_at_gmail.com> wrote:

>
> Either way you have to relink your homes and take care of those kernel
> specific RPMs (ocfs, powerpath, etc)
>
> http://download.oracle.com/docs/cd/E11882_01/install.112/e22489/rem_orcl.htm#CWLIN348
>
> The upgrade will keep you from doing the hairy task of finding/putting all
> of those Oracle related files back.
>
> I would prepare a workplan for both tasks - reinstall and OS upgrade.
> Then you'll find out which requires more work, which is more efficient,
> less risk, etc.
>
>
>
>
>
> -Karl
>
>
>
>
>
> On Sat, Oct 22, 2011 at 9:05 PM, Walker, Jed S <
> Jed_Walker_at_cable.comcast.com> wrote:
>
>> Here answers to the questions I've gotten:
>> The reasoning for the full install is that it is just cleaner than an
>> upgrade. As such it seems none of them have down an upgrade except in
>> practice or for a workstation.
>>
>> /var is a separate mount
>> /dev/mapper/RootVolGroup00-lv_root
>> 7.8G 3.0G 4.4G 41% /
>> /dev/mapper/RootVolGroup00-lv_var
>> 522G 30G 466G 6% /var
>> /dev/mapper/RootVolGroup00-lv_opt
>> 7.8G 458M 7.0G 7% /opt
>> Which is why I was thinking I could do this, but I know with Grid
>> Infrastructe the install changes at least some system configurations, so I'm
>> concerned about how to get that back, without knowing what it all is.
>>
>> Phillip: Are you saying you've done this several times with RAC. I know
>> with single instance I've done that and only need to make sure to bring over
>> /etc/oratab, but it's the Grid Infrastructure part that worries me.
>>
>>
>> From: Gus Spier [mailto:gus.spier_at_gmail.com]
>> Sent: Saturday, October 22, 2011 7:57 PM
>> To: william.muriithi_at_gmail.com
>> Cc: Walker, Jed S; oracle-l_at_freelists.org
>> Subject: Re: Reinstall OS completely without reinstalling Oracle
>>
>> I'm not really familiar with linux ... will you not have to
>> relink/recompile the executables once you upgrade from 5.3 to 5.5 ??
>>
>> v/r,
>>
>> Gus
>> On Sat, Oct 22, 2011 at 4:19 PM, William Muriithi <
>> william.muriithi_at_gmail.com<mailto:william.muriithi_at_gmail.com>> wrote:
>> On 22 October 2011 15:23, Walker, Jed S <Jed_Walker_at_cable.comcast.com
>> <mailto:Jed_Walker_at_cable.comcast.com>> wrote:
>> > So, here is the problem.
>> > We were given HP DL585G7s with RHEL5.3 installed. I installed 11.2.0.3.0
>> RAC.
>> >
>> > We just found that the DL585G7 is only certified with RHEL5.5 or later.
>> >
>> > The SA team would rather install the OS from scratch than do an upgrade,
>> and I understand the reasoning behind it.
>> I do not understand. Do you mind enlighten us? Personally yum update seem
>> fine
>> >
>> > The oracle grid and db homes are in /var/oracle.
>> >
>> > Does anyone know if it is possible to reinstall the OS from scratch
>> without touching /var/oracle so we don't have to reinstall Oracle? I'm
>> thinking /etc/oratab can be save/restored or recreated, but I think the big
>> problem would be that init scripts and so forth would be removed by the
>> fresh install.
>> >
>> If /var/oracle is a partition, they should be able to re-install
>> without destoying it. However, if its a directory on the root
>> partition, a fresh install will destroy everything
>>
>> type mount and see if /var/oracle is a separate partition
>> > Thanks,
>> >
>> > Jed
>> >
>> >
>> > --
>> > http://www.freelists.org/webpage/oracle-l
>> >
>> >
>> >
>> William
>> --
>> http://www.freelists.org/webpage/oracle-l
>>
>>
>>
>> --
>> http://www.freelists.org/webpage/oracle-l
>>
>>
>>
>
>
> --
> Karl Arao
> karlarao.wordpress.com
> karlarao.tiddlyspot.com
>

-- 
Karl Arao
karlarao.wordpress.com
karlarao.tiddlyspot.com

--
http://www.freelists.org/webpage/oracle-l

Received on Sun Oct 23 2011 - 02:43:40 CDT