Backup RAC with RMAN..(on diff file system)..URGENT..HELP NEEDED

hello all,
I have not work a lot on SAN storages. One of my client has implementated 9i RAC. Now he wants to Add two more disk in SAN storage (Implemented RAID). So sun engineers will do this but before this i have to take full database backup(80GB database) throught RMAN. The problem or confussion from my side is that the database is on Sun SAN storage and i have to put the Full database backup taken by RMAN on local hard disk on the node (node 1 of rac). Is the possible since the SAN storage is RAW file system (as i guess) and i am putting the backup on local system.
Please help me out ...i have do this in couple of days..
Please tell me prosedure too to how to change the path of backup in RMAN if above is possible..
Its urgent
Thanks and Regards!!
Pankaj Rawat

You best bet is to get your san folks to give you some disk space for a mount point on the last node in the cluster. Once they assign the lun (not raw) have your SAs make it a mounted file system such as /dbbackup.
Run all of your rman backups on your last node on the cluster. The only draw back is, if that node dies, then you will not be able to run backups. but your backups would be safe as they are on the san.
Only way to have a mounted file system on all nodes in your cluser is to have some sort of third party file system cluster ware .. such as veritas or OCFS2 - then all nodes could see it.
I feel the first node in the cluster (the primary node) is the most busy out of the rest .. so thats why the suggestion of running rman on the last node in the cluster.

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