How to stop a rman backup in progress?

OS: AIX 5.3 L and Oracle 10g R2
I got panic when my scheduled rman backup (incremental level 0 plus archivelog) run too long and I want to stop the process. I could not find the rman doc mentioning how to use any rman command to do that, instead of just shutdowning the database instance.with ps -ef, there were just too many PID of oracle. Is there a way by rman to STOP the process?
Furthermore, I had no idea why it happened. Last week when I did a full copy backup, it only took 23 minutes for 32G database, Today, I changed the scheme to a level 0 incremental, and it is still running after 5 and half hours. But it already created the archivelog, datafile backupset (checked by the DB control). How to find out what went wrong?

I did not use any third party application with rman or TSM in my AIX. what is the tdpo? Killing at OS level is probably only thing I can do now. kill -9 PID#
Message was edited by:
user508054
Message was edited by:
user508054

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