Reinstall DB and ASM using existing RAW devices in RAC

Hi,
We have two Database servers in Cluster environment DB1 and DB2 using CX300(SAN) as Storage device.Recently we had upgraded the OS kernel on DB1 from RHEL 3 to RHEL 4 and DB2 is still running on RHEL 3. Due to some application problems we wanted the DB1 to be rollbacked to RHEL 3
DB1-has ASM1 instance and DB2 has ASM2 instance running.Similary SID1 and SID2 on both of them.
Since we want to roll back to RHEL 3 it is a clean install on DB1. So my problem is I had never done this kind of reinstallation of DB and ASM using existing raw devices.
Can Someone sent me out some instructions and steps on how to do the reinstall without disturbing RAC,DB2 and Data on RAW/CX300(SAN) device.
I am basically a system admin not a complete Oracle DBA.I will be grateful for your help.
Thanks,
Shiva

It means, before proceeding a proper database backup must be taken, then it has to be started from scratch. RHEL3 is certified with 10gR1 and 10gR2, you should be aware of the patchsets available for the oracle version.
I suggest you to read the Clusterware and RDBMS installation guides:
Oracle® Database Release Notes
10g Release 2 (10.2) for Linux x86
B15659-03
Oracle® Database Oracle Clusterware and Oracle Real Application Clusters Installation Guide
10g Release 2 (10.2) for Linux
Part Number B14203-08
Installing Oracle RAC 10g Release 2 on Linux x86
~ Madrid

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790066 wrote:
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