What would cause a lot of redo or logswitches in an instance with no users?

Hello all,
I've got a database instance that is set up as a 3 node RAC cluster. I don't think this is RAC related, but the database issues is causing RAC issues.
The instance has been set up, and later will be used to temporarily hold data while another box is being rebuilt. This instance has not had anything imported into it...there are no users connecting to it.
However, it seems to be generating a LOT of redo and archive log traffic. So much so..that overran the db_recovery_file_dest_size of 8GB.
I'd not been monitoring this instance like I said before....nothing is in it, and noone should be connecting to it...but it filled up the 8G..and then, started writing tons of logs to /u01/app/oracle/diag/rdbms/instance1/INSTANCE1_node3/trace/ saying it was full...and eventually filling up the /u01 filesystem..causing things to crash.
I fixed all this by deleting the alert logs to make room. I then did an RMAN job to move the archive logs to tape..and it came back up.
However, just an hour later...I see over 15% of the FRA is filled up again?!?!?
Any ideas on where to start to troubleshoot this? I don't know what is causing this thing to generate redo at all.....
Thanks in advance,
cayenne

I've got a database instance that is set up as a 3 node RAC clusterThat would mean 1 database with 3 instances.
Are all 3 instances writing a high volume of redo ? Or is it only one of the three instances ?
When you check for scheduled jobs in DBA_JOBS and DBA_SCHEDULER_JOBS, check all 3 instances.
Hemant K Chitale
http://hemantoracledba.blogspot.com

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