Glassfish v3.1 disable connection pool

hi everyone!
I have a full JEE 6 application running in glassfish v 3.1.2.2 . It uses an oracle connection pool to get data and save data.
For maintenance reasons, I need to release all the connections in the pool before the database area start it tasks.

Glassfish has an option to disable jdbc resources, but I don't find an option to disable a connection pool.

Is there a way to accomplish this without getting the domain down? (this is not an option in this case)

Thanks in advance