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Questions about SAP installation on Oracle RAC

Former Member
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Hi,

I'm beginner with SAP.

I've to install SAP on oracle RAC.

I've some question about it ?

I've read SAP suports onky OCFS2 and not ASM.

What is the reason ?

I've read CRS and Oracle RDBMS must be installed on a share CFS disk.

Is there a possibility to install it locally on all nodes of the cluster ?

In different documentation, I saw the oracle directories recommanded by SAP were the following :

/oracle/<SAPSID>/102_64 for the $ORACLE_HOME and /oracle/<SAPSID>/ for the datafiles ...

Can we change these directories ?

Rgds,

Rachel

Accepted Solutions (0)

Answers (3)

Answers (3)

Former Member
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Hi,

I've read SAP suports onky OCFS2 and not ASM. 
What is the reason ?

Please check SAP Note 105047 - Support for Oracle functions in the SAP environment

I've read CRS and Oracle RDBMS must be installed on a share CFS disk.
Is there a possibility to install it locally on all nodes of the cluster ?

Please check SAP Note 1171095 - Information about Oracle RAC 10.2

In different documentation, I saw the oracle directories recommanded by SAP were the following :
/oracle/<SAPSID>/102_64 for the $ORACLE_HOME and /oracle/<SAPSID>/ for the datafiles ...
Can we change these directories ?

Please check the below link:

http://help.sap.com/saphelp_nw70/helpdata/en/20/f8e36764b1e049beee648a987e4315/content.htm

This is the only directory structure supported by SAP for all SAP installations with Unix OS and Oracle database as backend.

regards,

Subhajit.

Former Member
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Hello Rachel,

please find my answers in below to your questions..

Q)I've read SAP suports onky OCFS2 and not ASM.

What is the reason ?

ans:) Please find following link

http://decipherinfosys.wordpress.com/2007/11/12/ocfs-asm-raw-devices-and-regular-filesystem/

OCFS is to enable Oracle Real Application Cluster (RAC) users to run the clustered database without having to deal with RAW devices. The file system was designed to store database related files, such as data files, control files, redo logs,

archive logs, etc.

With OCFS2, one can store not only database related files on a shared disk, but also store Oracle binaries and configuration files (shared Oracle home) making management of RAC even easier.

Q) I've read CRS and Oracle RDBMS must be installed on a share CFS disk.

Is there a possibility to install it locally on all nodes of the cluster ?

ans:) Oracle CRS software must be installed on shared CFS as this is mandatory for CRS release 10.2,

the second reason why CRS to be on shared CFS so as to be visible/accesible to all the nodes.

Oracle RDBMS should also be installed on shared CFS so as to be visible/accessible to all nodes, Oracle RDBMS should also be visible/accessible by SAP nodes too.

Q)In different documentation, I saw the oracle directories recommanded by SAP were the following :

/oracle/<SAPSID>/102_64 for the $ORACLE_HOME and /oracle/<SAPSID>/ for the datafiles ...

Can we change these directories ?

ans:) Those directories are designed by SAP and as the database creation is done by SAP during instalaltion SAP understands those directories.

Change is not advisible.

Hope I have answered to your questions.

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Hi,

> I've read SAP suports onky OCFS2 and not ASM.

Currently SAP does not support ASM (probably will do it for 11gR2).

Depending on your OS, OCFS2 is the only cluster filesystem supported. See SAP Note 527843 "Oracle RAC support in the SAP environment" for the details

Reasons? That was the decision between SAP and Oracle, I do not know if the details were made public somewhere. No guessing from my part here.

> I've read CRS and Oracle RDBMS must be installed on a share CFS disk.

> Is there a possibility to install it locally on all nodes of the cluster ?

Technically, yes. But that is NOT supported by SAP, if you run into any issue, then you will battle with support. I think also the BR* require such configuration (not sure here)

> Can we change these directories ?

Yes, but why?

SAP expect the things to be in its "place" and those are the "places" where SAP put the data and recommend to do it. If you move things around and change properly the environment variables, SAP will work, but then support can go crazy trying to "help". Again, I would not recommend to change them unless there is a very good reason (again, it is to avoid issues with support)