Database Software

I've tried to research how to do this, but I seem to be going in circles.

Here's my situation:

For one of our 'tier' levels of support, our company requires we write our RMAN backups to TSM (Tivoli Storage Manager), along with at least one archivelog every 30 minutes.

Problem with the above is that we have had numerous issues with TSM and/or the SAN location that these files are written in the way our SVC is configured.

As the DBAs responsible for ensuring a reliable restoration in the event of a catastrophy, we prefer to keep the RMAN files on disk that we can access (still on the SAN).

First question is if it is possible to write to both locations.

Second question is if it is not possible to write to both locations, can I write our nightly RMAN backups (level 0) to disk, and then write our archivelogs to TSM (every 30 minutes) and still be able to do a restore and recovery?

Thanks for any help you may offer.