ASM Home under Cluster Configuration

Hi Guys
I need some information regarding how and from where OCR get information.
I have 3 Oracle Homes , DB_HOME,ASM_HOME and CRS_HOME. When I create ASM instance, I export my ORACLE_HOME=DB_HOME and run dbca . From there I create my ASM Instance. Everything works fine, up and running.. No issues.
Now, When I do ocrdump on the system OR run srvctl config command on ASM instance
e.g.
srvctl config asm -n node1, I get
+ASM1 /u01/oracle/product/10.2.0/asm
Now, My question is, How does OCR got this Oracle Home for ASM. From where does it read? I never exported or pointed ASM_HOME in my environment while creating ASM instance.
Any idea? I will appriciate your help.
Thanks
PG

Now I am ready to create database using ASM (I don't have any ASM yet, just the binaries). So I export ORAC_EHOME = DB_HOME and run dbca (dbca is using DB_HOME binary). I create ASM, Disk Groups, Database everything. Works normalThis defeats the purpose of having an ASM_HOME.. the idea of having a separate ASM_HOME is to support different releases of ASM while keeping the RDBMS version different.. Which means you have to run DBCA to create the ASM instance, disks and disk groups from the ASM_HOME/bin directory.
At this stage agreed the version/binaries are all the same. But one of the ideas of having separate homes is for the future in case we have different versions between the ASM instance and the RDBMS instance.
Does Oracle scans itself and look for directories OR Does oracle scan Oracle Inventory and look for ASM_HOME or something?I don't think Oracle scans anything.. but uses the environment variables you give during installation (OUI)and stores this information into the OCR.
Message was edited by:
Murali Vallath

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sergeko wrote:
I would use the same user id.Thanks. I know that. No problem with ASM home under the same user id as DB instance. But why did Oracle put this demo on OTN site?
http://www.oracle.com/technology/obe/demos/10gr2/asm_install_diff_home.viewlet/asm_install_diff_home_viewlet_swf.html
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Hi,
<< Oracle Documentation >>
Keep the following in mind when installing ASM:
When running more than one database instance on a single server or node, it is recommended that you install ASM in its own Oracle home on that server or node. This is advisable even if you are running only one database instance but plan to add one or more database instances to the server or node in the future.
With separate Oracle homes, you can upgrade and patch ASM and databases independently, and you can deinstall database software without impacting the ASM instance.
If an ASM instance does not already exist and you select the OUI option to install and configure ASM only, OUI installs ASM in its own Oracle home.
If you are running a single database instance on a server or node and have no plans to add one or more database instances to this server or node, ASM and the database can share a single Oracle home
If an ASM instance does not already exist and you select the OUI option to create a database that uses ASM for storage, OUI creates this single-home configuration.
Have a look at the following documents:
1) ML NOTE:265633.1 ASM Technical Best Practices
2) http://julian.dyke.users.btopenworld.com/com/Blog/2007_01_01_archive.html
3) http://www.dell.com/downloads/global/solutions/Oracle_DB_Deployment_with_Separate_ASM_and_Database_Home_Final_Web_Ready.pdf
4) http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/storeman.htm#i1021337

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Hi,
user5448593 wrote:
I'm fairly new to RAC/ASM and haven't performed any patch set upgrades yet. Back in the simple days when I wanted to apply a patch set to a database, say from 10.2.0.4 to 10.2.0.5, I would create a brand new Oracle home ahead of time and apply the patch set to it.
Now with CRS and ASM, is there a way to pre-stage a new home for those, but not have them "active" to the node until later during the maintenance window?Although you have not mentioned the version you are actually on, it is a quite up-to-date question and dilemma.
Starting with 11.2 for Grid Infrastructure only "out-of-place" patchset upgrades are supported.
>
For ASM, it seems like it would be possible to treat the same way as database and simply update ASM SID in /etc/oratab
+ASM1:/opt/oracle/product/10.2.0.5/asm1
but I'm not totally confident in that as I'm afraid the CRS home may already have references to the ASM home in the cluster registry.
For CRS, it seems like the home is pretty well hard-wired into the node startup scripts and installing a brand new CRS home will probably disrupt the running CRS home.
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By the way, what is your upgrade path? It could be easier to answer your questions if we knew that as there has been a quite a few enhancements and changes in the upgrade/patching process from 10g to 11g. (even between 11gR1 and 11gR2)
Regards,
Jozsef

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2. /u01/app/devel/product/10.2.0/db_1
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Thanks all in advance

Rakhi -
It seems when you executed localconfig add from root, you choose below home
/u01/app/test/product/11.1.0/db_1/bin/localconfig
I checked for localconfig file on my 11g installation, it seems ORACLE_HOME is hardcoded in this file.
<code>
[root@js bin]# more localconfig
#!/bin/sh
# localconfig.sbs for local CSS
# This script file should be run for following three cases:
# 1) add: When you are configuring the CSS for the first time
# 2) delete: When there is only one single instance Oracle home on a node and
# you are deleting/deinstalling that Oracle home
# 3) reset: When there are more than two single instance Oracle homes on a
# node and you are deleting/deconfiguring the Oracle home that
# currently runs CSS daemon but you want CSS to run from a
# different Oracle home
# NOTE: When using 'reset' option. This script can be run from
# source Oracle home or destination (Where CSS is to be reset to) Oracle
# home.
SILENT=%s_silent%
CSS_ORACLE_HOME=/u01/app/oracle/product/11g
CSS_ORACLE_OWNER=oracle
CSS_DBA_GROUP=dba
CSS_LANGUAGE_ID=AMERICAN_AMERICA.WE8ISO8859P1
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Message was edited by:
pinjam

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SQL*Plus: Release 10.2.0.3.0 - Production on Sat Jul 3 15:25:11 2010
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
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When saying "oracle home" we do not mean the home directory for 'database' type instance or the home for 'asm' type instance. There is just one term, Oracle Home - which means oracle software installation directory - not regarding which type of instance is run from this directory(i.e. from oracle home).
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Regarding to your configuration, you yourself answered to your question in your first post(question). your database and asm instances both share the same oracle home, which is shown via entries in your oratab file
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+ASM1:/u01/app/oracle/product/10.2.0/db_1:N
ractest:/u01/app/oracle/product/10.2.0/db_1:N

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So you are telling me that, if this 3 node RAC
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ASM Home under Cluster Configuration

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