RAC using templates /u01 corrupt file system

Hi,
newbie to the forum - please be gentle ;o)
Trying to install RAC using virtualbox and templated. Get to the point of just before first boot interview when vnc'd into the virtual machines. But the boot fails with a corrupt /u01. ANyone had corrupt /u01 before ? How to stop it happening ? I tried to continue by using "fsck -a" but it would not allow automatic fix. So I tried manually going through each error ( but there are thousands ). Also tried taking /u01 out of fstab to get first interview. But then the installed failed after doing buildcluster.sh due to same issue ( corrupt /u01 ).
Have tried creating new VMs - always getting corrupt /u01.
Any thoughts / ideas welcome.
Thanks.

Arf,
I am new to RAC. I analyzed Alejandro's script. He is main connection is to the first instance; then through sql*plus, he gets connected to the second instance. he exits the second instance and starts with RMAN backup to the database . Therefore the backup to the database is done from the first instance.
I do not see where he setenv again to change to the second instance to run RMAN to backup the second instance. It looks to me that the backup is only done to the first instance, but not to the second instance. I may be wrong, but I do not see the second instance backup.
Kindly, I request your assistance on the steps/connection to backup the second instance. Thank you so much!! Terry

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Robert, thank a lot for your know how. You helped me to clarify some doubts. To complete your answer, I will add two more details, based on my experience.
After to execute, type -> auto configure and label, the disk was created with different partitions like root, swap, usr, like this:
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