Ocfs2 users - Mar 2008 - Is the order important when installing ocfs2 and Oracle RAC?

Is the order important when installing ocfs2 and Oracle RAC?
 
If you have an existing RAC installation and you want to use ocfs2  for shared
files but not for the OCR or Voting Disks, do you need to reinstall the Oracle
Clusterware after installing OCFS2?
 
Regards,
Nick Donatone
 
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My understanding is this:
OCFS2 can be used without RAC.
RAC needs either OCFS2 (some kind of 3rd party cluster) for OCR & Voting
disks
or ASM.

Regards,
Natarajan

--- Nicholas Donatone <nick.donatone@oracle.com> wrote:
> Is the order important when installing ocfs2 and Oracle RAC?
>  
> If you have an existing RAC installation and you want to use ocfs2  for
> shared files but not for the OCR or Voting Disks, do you need to reinstall
> the Oracle Clusterware after installing OCFS2?
>  
> Regards,
> Nick Donatone
>  
> > _______________________________________________
> Ocfs2-users mailing list
> Ocfs2-users@oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-users


     
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2008/3/26, Nicholas Donatone
<nick.donatone@oracle.com>:
>
>  Is the order important when installing ocfs2 and Oracle RAC?
>
> If you have an existing RAC installation and you want to use ocfs2  for
> shared files but not for the OCR or Voting Disks, do you need to reinstall
> the Oracle Clusterware after installing OCFS2?
>
> Regards,
> Nick Donatone
>
>
> _______________________________________________
> Ocfs2-users mailing list
> Ocfs2-users@oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-users
>

afaik no, Oracle clusterware is in another world.  If  you  plan to use
ocfs2 to share filesystems  this will not disturb clusterware ( well, more
traffic in the interconnect, as natural )

Even in the case of need to use ocfs2 to give concurrency to an installed
clusterware RAC, you will have downtime while reallocating crs/ocr
destinations but can be done safely without reinstall. FYI: Is what you must
do in case of clusterware 10gR2 on RHEL 5 and EMC Powerpath 5.1 storage


Regards

D.
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El mi?, 26-03-2008 a las 08:01 -0700, Natarajan P.
escribi?:
> My understanding is this:
> OCFS2 can be used without RAC.
> RAC needs either OCFS2 (some kind of 3rd party cluster) for OCR &
Voting disks
> or ASM.
> 
> Regards,
> Natarajan

You can use raw devices ( char dev ) or block devices if your oracle
binaries has O_DIRECT ( 10gR2 has it by default iirc ) for oracle
clusterware.

AS far as I understand, Nicholas asked if we have an existing RAC ( for
example under ASM ) and in a point in time you want to use ocfs2 to
share some filesystems ( comes to my mind the UTL_FILE_DIR ). If this
assumption is correct, you can install/configure/use RAC with ASM and
some time after you can install ocfs2 and configure it without touching
nothing from RAC infrastructure/environment.


D.