Why we need CRS in Oracle10g RAC

When i am having third party cluster solution like Veritas(SFRAC for Oracle), why its not possible to configure Oracle10g RAC with Veritas without CRS ?????
Its possible in Oracle9i but why not in Oracle10g ????

because ASM is there !!!
in 10g you do not have to use raw devices to store data files : you just use the ASM instance which comes free and provides the performance of the raw devices with the management capabilities of any filesystem
you only need to configure raw devices for the OCR and Voting Disk (but this is really simple !!! compared to the management problem of storing datafiles on raw (no autoextend , mapping and so on)

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CRS HOME & 9iR2 RAC ORACLE_HOME Different Owners

Facts:
2 Node Cluster, Sun T2000
O/S: Sun Sparc Solaris 64 bit 5.10
3rd Party Clusterware - Veritas Storage Foundation for RAC (SFRAC) 5.0 MP3
CRS: 10.2.0.4
CRS is owned by oracle:dba (with the exception of anything owned by root)
9iR2 (9.2.0.8) RAC RDBMS ORACLE_HOME is owned by oraofsg:dba
9iR2 (9.2.0.8) RAC Database Name: ofsg
10gR2 (10.2.0.4) RAC RDBMS ORACLE_HOME is owned by oracle:dba
Metalink note 220970.1
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Task at Hand:
Need to register 9.2.0.8 RAC database ofsg under 10gR2 CRS.
Issue:
As 9i RAC database owner oraofsg with the 9i RAC environment set, and 9i GSD down:
srvctl add database -d oraofsg -o /sv01/sw/oraofsg/ofsgdb/9.2.0
PRKR-1005 : adding of cluster database ofsg configuration failed, PROC-5: User does not have permission to perform a cluster registry operation on this key. Authentication error [User [oraofsg] does not match with initialized user] [0]
Question: Has anyone successfully registered a 9i RAC database under 10g CRS?
Thanks for your consideration.
Regards,
Jerry

Hi
CRS_HOME must be owned by a different user:group (preferably root) than $ORACLE_HOME (owned by oracle), for several reasons like patching.
Please note also that you will need an ASM dedicated home and also a AGENT_HOME that can be owned by oracle.
Hope this helps.

Oracle10g RAC vs Oracle9i RAC with WebLogic

Hello, I am planning on installing Oracle RAC on Redhat's Linux AS 3.0, while BEA's WebLogic will the application server.
What would you choose as the back end, Oracle9i RAC or Oracle10g RAC and why ?
Also, what release/patch-level (sp ??) of Linux A.S should be used ?
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Tom

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Tim
---

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Why we need CRS in Oracle10g RAC

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