Recovery After OS failed upgrade

We will be upgrading our OS from Oracle Linux 5 update 2 to Oracle Linux 5 update 9. I want to ensure we can recovery if anything goes wrong. We have a three node RAC with the following setup:
Oracle Linux 5 update 2
Oracle Grid Infrastructure 11.2.0.2
Oracle Database 11.2.0.2
Backup Software: Netbackup
Disks
OS and Oracle Software Installations on Mirrored Disk (ext3)
DATA Diskgroup on RAID10 (ASM)
FRA Diskgroup on RAID10 (ASM)
GRID Diskgroup on Mirrored Disk (ASM) -- OCR/Voting Disks/ASMParameterfile
SCENARIO: OS upgrade fails and we need to recovery to backup. Have OS/Oracle Software partition file-based backup. We have RMAN database backup.
Questions
* SysAdmin says he can only perform file-based backup of OS/Oracle Software partition. Is a file-based backup sufficent or is a image (bare-metal) backup required?
* ASMLib packages will be upgraded. Will this affect ASM Disk or data on ASM disks?
* What additional steps should be performed to ensure successful restoration?
* Any recommended steps that may not be required?
Thanks in advance.

Filebased backup will be sufficient in my experience.
1. make sure GI is copied as root
2. to copy central inventory
3. /etc and Local Cluster Registry
4. make sure you do it at one node per time
5 .Even oracle os backup fails, the GI and DB homes can be copied and cloned over from other survived nodes
Regards
Ed Rudans
http://erudans.blogspot.com

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