BeOS Release 4 includes support for Adaptec, Symbios and BusLogic PCI-based SCSI cards.
Adaptec cards based on Future Domain technology (e.g., the AHA-2920), however, will not be supported. (Future Domain was purchased by Adaptec, and these cards are really Future Domain cards, not Adaptec cards. Totally different beast.)
For the latest information on what SCSI cards are supported, check the BeOS Ready List: