Well, Symantec does not recommend that config. And as you now experience, it's unstable! It's recommended to use a stand alone SCSI adapter. Even though a faulty device or bad driver could be the reson, based on the error message, it's more likely the hardware config in this case.
http://seer.support.veritas.com/docs/280011.htm
Message was edited by:
Christian BorthenMessage was edited by:
Christian Borthen