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AAC(4) Device Drivers Manual AAC(4)

aac
Adaptec SAS/SATA/SCSI RAID controller

aac* at pci?

The aac driver provides support for Adaptec's "FSA" family of RAID controllers, including:
Adaptec AAC-2622, AAC-364, AAC-3642
 
Adaptec 2130S, 2200S, 2230SLP, 2410SA, 2610SA, 2810SA, 21610SA
 
Dell CERC-SATA, PERC 320/DC
 
Dell PERC 2/QC, PERC 2/Si, PERC 3/Si, PERC 3/Di
 
HP NetRaid-4M
 
IBM ServeRAID-8i/8k/8s
 
All the RAID set volume management is done via the card BIOS.
This driver makes drives and/or RAID sets appear as sd(4).

intro(4), scsi(4), sd(4)

The aac driver first appeared in OpenBSD 2.9.

The aac driver was written by Niklas Hallqvist <niklas@openbsd.org>, inspired by the FreeBSD driver by Mike Smith <msmith@freebsd.org>.

The card provides a mechanism to do online RAID set management, unfortunately the protocol is not public.
July 16, 2013 OpenBSD-6.1